def xxx(X,Y):
    x=[0,-2,-2,-1,-1,+1,+1,+2,+2]
    y=[0,+1,-1,+2,-2,+2,-2,+1,-1]
    for i in range(9):
        for j in range(9):
            for k in range(9):
                if (X,Y)==(x[i]+x[j]+x[k],y[i]+y[j]+y[k]):
                    return "YES"
    return "NO"

X,Y=map(int,input().split())
print(xxx(X,Y))