#include <stdio.h>

int main() {
    int x=15;
    int y;
    long z=1;

    for(y=1; y<=x; y++) {
        printf("______________\n"); 
        printf("y = %d\n", y);
        printf("z = %ld\n", z);
        z=z*y;
        printf("z = z * y = %ld\n", z);
    }
}