While loop and cin

The code below should ask the user his weight and if the user puts > 15 it should do a while loop to increase it to 50 The code compiles sucessfully but no matter if you put > 15 it wont do the while loop.

#include <iostream>
using namespace std;

int main()
{


int weight;

cout <<"Current weight?"<<endl;
cin >>weight;
cout<<"Your weight:"<<weight<<endl;
if(weight>15){
        while(weight==50){
            weight = weight +1;
            cout <<"Weight:"<<weight<<endl;
        }

}
return 0;
}