#include<iostream>
using namespace std;
int main()
{
    int x=5;
    int y=10;
    if((x>5)&&(y<15))
    {
        cout<<"x+y: "<<(x+y)<<endl;
    }
    else if((x<=5)||(y>15))
    {
        cout<<"x-y: "<<(x-y)<<endl;
    }
    else
    {
        cout<<"!x"<<!x<<endl;
    }
    return 0;
}