#include
using namespace std;

int main()
{
    float a,b,c,d,y;
    cout<<"Enter number\n1) to combine \n2) To subtract\n3) to increase\n4) To divide\n";
    cin>>a;
    if (a==1)
    {
        cin>>b;
        cin>>c;
        d=b+c;
        cout<<"combine = "<<d;

    }
    if (a==2)
    {
        cin>>b;
        cin>>c;
        d=b-c;
        cout<<"\nsubtract ="<<d;

    }
    if (a==3)
    {
        cin>>b;
        cin>>c;
        d=b*c;
        cout<<"\nincrease ="<<d;

    }
    if (a==4)
    {
        cin>>b;
        cin>>c;
        d=b/c;
        cout<<"\ndivide ="<<d;

    }

    cout<<"\nYou have retry\n1)Yes\n2)No\n?";
    cin>>y;
    if (y==1)
    {
        main();
    }
    return 0;
}