#include <stdio.h>

int foo(int y) {
    int x=1;
    while (y>0) {
        if (y==10) break;
        else if (y==3) {
            y--; continue;
        }
        x=x*y;
        y--;
    }
    return x;
}

int main(void) {
    int i;
    while(1) {
      printf("y = ? ");
      scanf("%d", &i);
      if (y<0) break; 
      printf("foo(%d) = %d\n", i, foo(i));
    }   
    return 0;
}