Maximum sum

input/code.cpp:9:1: error: '::main' must return 'int'
    9 | int64_t main()
      | ^~~~~~~

#include <iostream>
#include <vector>
#include <cmath>
#include <algorithm>
#include <deque>

using namespace std;

int64_t main()
{
    int64_t n_numbers;
    cin >> n_numbers;
    

    vector<int64_t> storage;
    vector<int64_t> result(n_numbers, 0);

    for (int64_t i = 0; i < n_numbers; ++i)
    {
        int64_t temp;
        cin >> temp;
        storage.push_back(temp);
    }

    result[0] = storage[0];

    for(int64_t i = 1; i < n_numbers; ++i)
    {
        if(result[i - 1] + storage[i] >= storage[i])
        {
            result[i] = result[i - 1] + storage[i];
        }
        else
        {
            result[i] = storage[i];
        }
    }



    cout << *(max_element(result.begin(), result.end())) << endl;
}