Convert from euro or yen to dollar c++ program [karim hekal]

#include <iostream>
using namespace std;
int main()
{
    long euro,yen,pounds;
    int input;
    cout <<"From euro to dollar insert '1' , from yen to dollar insert '2' , From pounds to dollar insert '3'"<<endl;
    cout<<"= ";
    cin>>input;
    if (input==1){
    cout<<"Insert in 'euro' = ";
    cin>>euro;
    cout<<" = "<<euro*1.253;
    }
    else if (input==2){
    cout<<"Insert in 'yen' = ";
    cin>>yen;
    cout<<" = "<<yen*0.00846;
    }
    else if (input==3){
    cout<<"Insert in 'pounds' = ";
    cin>>yen;
    cout<<" = "<<yen*0.13947;
    };
    system("pause > nul");
}