This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
// ↘ ⬇ ⬇ ⬇ ⬇ ⬇ ↙
// ➡ IOI, IZhO ⬅
// ↗ ⬆ ⬆ ⬆ ⬆ ⬆ ↖
//⠀⠀⢠⣤⡄⢠⣤⣤⣤⣤⣤⣤⡄⢠⣤⡄⠀⠀⠀⠀⠀⠀⠀⠀
//⠀⠀⢸⣿⡇⢸⣿⣿⣿⣿⣿⣿⡇⢸⣿⡇⠀⠀⠀⠀⠀⠀⠀⠀
//⠀⠀⢸⣿⡇⢸⣿⣿⣿⣿⣿⣿⡇⢸⣿⡇⠀⠀⠀⠀⠀⠀⠀⠀
//⠀⠀⢸⣿⡇⢸⣿⣿⣿⣿⣿⣿⡇⢸⣿⡇⠀⠀⠀⠀⠀⠀⠀⠀
//⠀⠀⢸⣿⡇⢸⣿⣿⣿⣿⣿⣿⡇⢸⣿⡇⠀⠀⠀⠀⠀⠀⠀⠀
//⠀⠀⢸⣿⡇⢸⣿⣿⣿⣿⣿⣿⡇⢸⣿⡇⠀⠀⠀⠀⠀⠀⠀⠀
//⠀⠀⠀⠙⠃⠘⠛⠛⠛⠛⠛⠛⠃⠘⠋⠀⠀⠀⠀⠀⠀⠀⠀⠀
//⠀⠀⠀ ⠘⠛⠛⠛⠛⠛⠛⠛⠛⠃⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
//⠀⠀⠀⠀⠀⣠⣶⣶⠂⣰⣶⣶⣄⡀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
//⠀⠀⠀⢀⣾⣿⣿⡏⢠⣿⣿⣿⣿⣿⣆⠀⠀⠀⠀⠀⠀⠀⠀⠀
//⠀⠀⠀⡈⠻⣿⣿⣶⣾⣿⣿⣿⣿⠿⠋⡀⠀⠀⠀⠀⠀⠀⠀⠀
//⠀⠀⠀⣿⣶⣄⠙⣿⣿⣿⣿⣟⢁⣴⣾⡇⠀⠀⠀⠀⠀⠀⠀⠀
//⠀⠀⠀⢹⣿⡏⢠⣿⠟⠛⢿⣿⣿⣿⡿⠁⠀⠀⠀⠀⠀⠀⠀⠀
//⠀⠀⠀⠀⠙⠀⠀⣠⣶⣷⣤⡈⠛⠛⠁⠀⠀⠀⠀⠀⠀⠀⠀⠀
//⠀⠀⠀⠀⠀⠀⠈⠉⠛⠛⠋⠉⠀⠀
#include <bits/stdc++.h>
using namespace std;
#define int long long
#define all(x) x.begin(), x.end()
#define size(x) (int)x.size()
#define pb push_back
#define eb emplace_back
template<typename S>
bool chmin(S &a, const S b) {
if (a > b) {
a = b;
return true;
}
return false;
}
template<typename S>
bool chmax(S &a, const S b) {
if (a < b) {
a = b;
return true;
}
return false;
}
const int mod = 1e9 + 7;
const int inf = 1e9 + 7;
const int INF = 1e18 + 7;
const double eps = 1e-6;
const double EPS = 1e-9;
signed main() {
ios::sync_with_stdio(false);
cin.tie(nullptr);
int n, m;
cin >> n >> m;
int dp[m];
dp[0] = 4;
for (int i = 1; i < m; ++i) {
dp[i] = 4 + i + dp[i - 1];
}
cout << dp[m - 1];
}
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