Crescator1

#include <fstream>
using namespace std;

int main()
{
    int x,y,n=1;
    ifstream f("crescator1.in");
    f>>x;
    ofstream g("crescator1.out");
    while(f>>y)
    {
        if(y!=x)
            if(n%2)
            {
                g<<x;
                return 0;
            }
            else
                x=y,n=1;
        else
            x=y,++n;
    }
    if(n%2)
        g<<y;
    else
        g<<"nu exista";
    f.close();
    g.close();
    return 0;
}