Wythoff's Game

This one is not there in UVa online judge . Hope it works !
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Question: Wythoff's Queen Game
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#include "iostream.h"
#include "math.h"

int main() {
     int n, x, y, small, big, diff;
     float phi = (sqrt(5) + 1)/2;
     cin >> n >> x >> y;
     x--;
     y = n - y;
     small = (x < y)?x:y;
     big = x + y - small;
     diff = floor(small / phi);
     if(small + diff + 1 == big) cout << "2\n";
     else cout << "1\n";
     return 0;
}
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