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

int main()
{
    double A, C, p;

    printf("Enter the initial cost of the product: ");
    scanf(" %lf", &A);

    printf("Enter the desired cost of the product: ");
    scanf(" %lf", &C);

    while(A <= C)
    {

        printf("The initial cost is already lower or equal to the desired one. \nEnter the desired one again: ");
        scanf(" %lf", &C);
    }

    printf("Enter the percentage reduction in the cost of the product for the year: ");
    scanf(" %lf", &p);

    //printf("A = %lf \nC = %lf \np = %lf \n", A,C,p);

    for(int i = 1; i <= 10; i++)
    {
        A *= (1 - (p / i) / 100);
        printf("A = %lf\n", A);

        if(A < C)
        {
            printf("The cost of the product dropped below the desired cost after %d years\n", i);
            break;
        }
    }

    if(A > C)
        {
            printf("The cost of the product did not fall below the desired cost\n");
        }


    printf("Press any key to exit...\n");
    getchar();
    getchar();
    return 0;
}