func_code_string: #include <bits/stdc++.h>   using namespace std;   int a[] = {1, 2, 4, 3};   int b[] = {1, 3, 4, 2};   int c[] = {1, 4, 1, 4};   int d[] = {1, 1, 1, 1};   int main() {     string s;     cin >> s;     int n = s.length();     int rem = 0;     for (int i = 0; i < n; i++) {       rem = (rem * 10 + s[i] -  0 ) % 4;     }     int ans = a[rem] + b[rem] + c[rem] + d[rem];     ans %= 5;     cout << ans;     return 0;   }   