Program C++ Fungsi Rekursif

#include<iostream>
using namespace std ;
int main(){
int x,y,z,total=0;
cout<<"bilangan : ";
cin>>x;
    for (y = 21;y<=21;y++);
    for (z = 21;z<=x*21;z=z+21){
        cout<<z<<" ";
        total=total+z;
        }
        cout<<endl;
        cout<<"total : "<<total;
return 0 ;
}