My program not working help please.

#include <iostream>


int main ()
{
int a;
int b;
int sum;

    cout<<"enter the first value\n";
cin>>a;

    cout<<"enter the second value\n";
cin>>b;

     sum = a + b;

if (sum == 3)
{
    cout<<" you won ";
}
            return 0;
}