I can't find a problem
Please, help


my code (C++):


#include <iostream>
#include <string>
using namespace std;
int main()
{
    int a, b, c, sum, sr, i, n;
    cin >> n;
    cin >> a >> b >> c;
    sum = 0;
    if (n == 3) {
        sum = a + b + c;
        sr = 2;
    }
    else {
        for (i = 3; i < n; i++) {
            if ((a + b + c) > sum) {
                sum = a + b + c;
                sr = i - 1;

            }
            a = b;
            b = c;
            cin >> c;

        }
    }
    cout << sum<< " "<<sr;

    return 0;
}