#include <iostream>
#include <cmath>
using namespace std;
double IsPointInSquare(double x1,double x2)
{
double X, Y;
X = abs(X);
Y = abs(Y);
if ( X >= 0 && X <= 1 && Y >= 0 && Y <= 1)
cout << "Yes" <<endl;
else
cout << "No" <<endl;
return 0;
}
int main()
{
double X, Y;
cin >> X >> Y;
IsPointInSquare( X , Y);
return 0;
}
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