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

int pow(int n, int k);

int main(void)
{
    int n;
    printf("Enter number of x: ");
    scanf("%d", &x);

    double result = 0;
    for (int i = 1, i <= x; ++i)
    {
        double z, b, a, betta;
        printf("Enter Z, B, A, Betta for X%d", i);
        printf("Enter Z: ");
        scanf("%lf", &z);
        printf("Enter B: ");
        scanf("%lf", &b);
        printf("Enter A: ");
        scanf("%lf", &a);
        printf("Enter Betta: ");
        scanf("%lf", &betta);

        result += pow(z, 3) - b + pow(a / tan(betta), 2);
    }

    printf("y = %lf", result);

    return 0;
}

int pow(int n, int k)
{
    int l = n;
    for (int i = 2; i < k; ++i)
        l *= n;
    return l;
}