ABC-370 A - Raise Both Hands

def getIntMap():
    return map(int, input().split())
 
 
def main():
    L, R = getIntMap()
 
    h = L + R * 2
 
    print("Yes" if h == 1 else "No" if h == 2 else "Invalid")
 
 
if __name__ == "__main__":
    main()