Russian Peasant Algorithm vs Slow Multiplication

public static int RussianPeasantAlgorithm(int a, int b){
            int x = a;
            int y = b;
            int z = 0;
            while (x > 0){
                    if (x % 2 == 1){ z = z + y;}
                y = y << 1;
                x = x >> 1;
            }
            return z;
        }

        public static int NormalMultiplication(int a, int b){
            int x = a;
            int y = b;
            int z = 0;
            while (x > 0){
                z = z + y;
                x = x - 1;
            }
            return z;
        }