diff --git a/Lab1.cbp b/Lab1.cbp
index e54e0bb..031adb2 100644
--- a/Lab1.cbp
+++ b/Lab1.cbp
@@ -47,6 +47,8 @@
 			<Option target="&lt;{~None~}&gt;" />
 		</Unit>
 		<Unit filename="main.cpp" />
+		<Unit filename="prot.cpp" />
+		<Unit filename="prot.h" />
 		<Unit filename="svg.cpp" />
 		<Unit filename="svg.h" />
 		<Unit filename="text.cpp">
diff --git a/histogram.cpp b/histogram.cpp
index d9a550d..b8dd626 100644
--- a/histogram.cpp
+++ b/histogram.cpp
@@ -27,11 +27,12 @@ std::vector<size_t> make_histogram(std::vector<double> numbers, size_t bin_count
 
 
 bool find_minmax(std::vector<double> numbers, double& min, double& max) {
-    min = numbers[0];
-    max = numbers[0];
     if(numbers.size()==0){
         return false;
     }
+    min = numbers[0];
+    max = numbers[0];
+
     for (double number : numbers) {
         if (min > number) {
             min = number;
diff --git a/main.cpp b/main.cpp
index fc52f27..2ed1e79 100644
--- a/main.cpp
+++ b/main.cpp
@@ -2,12 +2,13 @@ using namespace std;
 #include "histogram.h"
 #include "text.h"
 #include "svg.h"
+#include "prot.h"
 
-#include <cstdio>
 
 struct Input {
     std::vector<double> numbers;
     size_t bin_count{};
+    int width;
 };
 
 Input input_data();
@@ -17,10 +18,13 @@ int main()
 
     Input in = input_data();
     std::vector<size_t> bins = make_histogram(in.numbers, in.bin_count);
-    show_histogram_svg(bins);
+    show_histogram_svg(bins, in.width);
+
+
     return 0;
 }
 Input input_data() {
+
     Input input_struct;
     size_t countOfNumbers;
     cerr << "Input your count of numbers:\n";
@@ -35,6 +39,10 @@ Input input_data() {
     cerr << endl;
     cerr << "Input bin count:\n";
     cin >> input_struct.bin_count;
+
+    input_struct.width = input_width(countOfNumbers);
+
+
     return input_struct;
 }
 
diff --git a/prot.cpp b/prot.cpp
new file mode 100644
index 0000000..0730946
--- /dev/null
+++ b/prot.cpp
@@ -0,0 +1,25 @@
+#include "prot.h"
+int input_width(int countOfNumbers){
+    const int BLOCK_WIDTH = 10;
+    bool check = false;
+    int width =0;
+    while(check == false){
+        std::cout << "Input width:"<<std::endl;
+        std::cin >> width;
+        if(width < 70){
+            std::cout << "width less 70" << std::endl;
+        }
+        else if(width > 800){
+            std::cout << "width more 800" << std::endl;
+        }
+        else if(width < countOfNumbers*BLOCK_WIDTH / 3.0){
+            std::cout << "менее трети количества чисел, умноженных на ширину блока " << std::endl;
+        }
+        else{
+            check = true;
+        }
+
+    }
+    return width;
+
+}
diff --git a/prot.h b/prot.h
new file mode 100644
index 0000000..e646aa6
--- /dev/null
+++ b/prot.h
@@ -0,0 +1,8 @@
+#ifndef PROT_H_INCLUDED
+#define PROT_H_INCLUDED
+#include <vector>
+#include <iostream>
+
+int input_width(int countOfNumbers);
+
+#endif // PROT_H_INCLUDED
diff --git a/svg.cpp b/svg.cpp
index 3a67cec..98ab11b 100644
--- a/svg.cpp
+++ b/svg.cpp
@@ -13,14 +13,13 @@ void svg_end() {
     std::cout << "</svg>\n";
 }
 
-void show_histogram_svg(const std::vector<size_t>& bins) {
+void show_histogram_svg(const std::vector<size_t>& bins, int TEXT_WIDTH) {
     const auto IMAGE_WIDTH = 400;
     const auto IMAGE_HEIGHT = 300;
     const auto TEXT_LEFT = 20;
     const auto TEXT_BASELINE = 20;
-    const auto TEXT_WIDTH = 50;
     const auto BIN_HEIGHT = 30;
-    const auto BLOCK_WIDTH = 10;
+
     svg_begin(400, 300);
 
     size_t maxCount = maxBin(bins);
diff --git a/svg.h b/svg.h
index c558da8..1cf2d0c 100644
--- a/svg.h
+++ b/svg.h
@@ -5,7 +5,7 @@
 #include <iostream>
 void svg_begin(double width, double height);
 void svg_end();
-void show_histogram_svg(const std::vector<size_t>& bins);
+void show_histogram_svg(const std::vector<size_t>& bins, int width);
 void svg_text(double left, double baseline, std::string text);
 void svg_rect(double x, double y, double width, double height,std::string stroke, std::string fills);
 
diff --git a/unittest.cpp b/unittest.cpp
new file mode 100644
index 0000000..0c09008
--- /dev/null
+++ b/unittest.cpp
@@ -0,0 +1,44 @@
+#define DOCTEST_CONFIG_NO_MULTITHREADING
+#define DOCTEST_CONFIG_IMPLEMENT_WITH_MAIN
+#include "doctest.h"
+#include "histogram_internal.h"
+
+TEST_CASE("distinct positive numbers") {
+    double min = 0;
+    double max = 0;
+    find_minmax({1, 2}, min, max);
+    CHECK(min == 1);
+    CHECK(max == 2);
+
+}
+TEST_CASE("empty vector") {
+    std::vector<double> numbers{};
+    double min=0, max=0;
+    CHECK(!find_minmax(numbers, min, max));
+}
+TEST_CASE("1 val") {
+    std::vector<double> numbers{1};
+    double min=0, max=0;
+    find_minmax(numbers, min, max);
+    CHECK(min == 1);
+    CHECK(max == 1);
+}
+TEST_CASE("- val") {
+    std::vector<double> numbers{-1,-2};
+    double min=0, max=0;
+    find_minmax(numbers, min, max);
+    CHECK(min == -2);
+    CHECK(max == -1);
+}
+TEST_CASE("same val") {
+    std::vector<double> numbers{2,2};
+    double min=0, max=0;
+    find_minmax(numbers, min, max);
+    CHECK(min == 2);
+    CHECK(max == 2);
+}
+TEST_CASE("check prot1") {
+    check(input_width(int countOfNumbers, 10));
+
+}
+