#include <stdio.h>

unsigned int multiply(unsigned int x, unsigned int y)
{
    if (x == 1)
        return y;
    
    if (x > 1)
        return y + multiply(x - 1, y);

    return 0;
}

int main()
{
    printf("3 times 100 is %d", multiply(3, 100));

    return 0;
}