#include <stdio.h>
#define M 10000

int f(unsigned int x) {

        if (x == 0)
                return 1;

        return x*f(x-1);
}

int delay() {

        int j,i;
        for (j=0;j<M;j++)
                for (i=0;i<M;i++);
        return 0;
}

int main(int argc, char *argv[]) {

        int i;
        for (i=0;i<=15;i++)
                if (!delay())
                        printf("%d! = %u\n",i,f(i));
}