public class Main {
	
	public static void main(String[] args) {
		System.out.println(mult(6, 5));
	}
	
	private static long fakultaet(long z) {
		if(z != 0) return z*fakultaet(z-1);
		return 1;
	}
	
	private static int fibonacci(int i) {
		if(i == 0) return 0;
		if(i == 1) return 1;
		return fibonacci(i-1) + fibonacci(i-2);
	}
	
	private static int nachfolger(int z) {
		return z+1;
	}
	
	private static int sum(int n, int m) {
		if(m == 0) return n;
		return sum(nachfolger(n), m-1);
	}
	
	private static int mult(int n, int m) {
		if(m == 0) return n;
		return sum(mult(n, m-1), n);
	}
	
	private static int acker(int x, int y) {
		if(x == 0) return y+1;
		if(y == 0) return acker(x-1, y);
		return acker(x-1, acker(x, y-1));
	}
	
	private static int ulam(int x) {
		if(x == 1) return 1;
		if(x > 1) {
			if(x%2 == 0) {
				return ulam(x/2);
			} else {
				return ulam((3*x)+1);
			}
		}
		return -1;
	}

}