Babu

#include <iostream>
using namespace std;
void sum(int &sm, int &N, int &n){
    int a(0);
    scanf("%d",&a);
    sm += a;
    if(n<N){
        ++n;
        sum(sm, N,n);
    }
}
int main() {
        int N =0;
    cin >>N;
    int n=1;
    int sm=0;
    sum(sm, N,n);
    cout << sm;
}