#include <stdio.h>
#include <stdlib.h>
#include <math.h>

int main() {
    float A, B;
    int n;

    // Input values A and B
    printf("Enter value A: ");
    scanf("%f", &A);
    printf("Enter value B: ");
    scanf("%f", &B);

    // Input size of vector X
    printf("Enter size of vector X: ");
    scanf("%d", &n);

    // Create vector X
    float* X = (float*)malloc(n * sizeof(float));
    if (X == NULL) {
        printf("Memory allocation error.\n");
        return 1; // Exit the program with an error
    }

    // Input elements of vector X
    for (int i = 0; i < n; i++) {
        printf("Enter element X[%d]: ", i);
        scanf("%f", &X[i]);
    }

    // Initialize sum and counter
    float total_sum = 0;
    int count = 0;

    // Iterate over elements of vector X and check condition
    for (int i = 0; i < n; i++) {
        if (fabs(X[i] - A) < B) { // Check condition
            total_sum += X[i];  // Sum the suitable element
            count++;             // Increase the counter
        }
    }

    // Output results
    printf("Sum: %.2f\n", total_sum);
    printf("Count of elements: %d\n", count);

    // Free allocated memory
    free(X);

    printf("Press any key to exit...\n");
    getchar(); // To consume the newline character left by previous input
    getchar(); // Wait for user input
    return 0; // Exit the program
}