import IO;

public int halve(int n) = n/2;

public int double(int n) = n*2;

public bool uneven(int n) = (n % 2) != 0);

public int ethiopianMul(int n, int m) {
	result = 0;
	while(n >= 1) {
		if(uneven(n))
			result += m;
		n = halve(n);
		m = double(m);
	}
	return result;
}