#include <stdio.h>

int faculteit(int n) {
    int i, res = 1;
    if (n >= 0 && n <= 12) {
        for (i = 1; i <= n; i = i + 1) {
            res = res * i;
        }
    }
    else {
        res = -1;
    }
    return res;
} 

int main(void) {
    int n, fac;
    for (n = 0; n <= 13; n = n + 1) {
        fac = faculteit(n);
        if (fac != -1) {
            printf("%d! = %d\n", n, fac);
        }
        else {
            printf("%d! = te groot\n", n);
        }
    }
    getchar();
    return 0;
}