#include <stdio.h>

int gcd(int m, int n)
{
        int tmp;
        while(m) { tmp = m; m = n % m; n = tmp; }
        return n;
}

int lcm(int m, int n)
{
        return m / gcd(m, n) * n;
}

int main()
{
        printf("lcm(35, 21) = %d\n", lcm(21,35));
        return 0;
}