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- #include <stdio.h>
- #include <string>
- #include <vector>
- #include <iostream>
- #include <fstream>
- #include <algorithm>
- #include <set>
- #include <map>
- #include <unordered_set>
- #include <unordered_map>
- #include <list>
- #include <deque>
- #include <memory>
- #include <utility>
- #include <queue>
- #include <math.h>
- #include <ctime>
- #include <random>
- #include <functional>
- using namespace std;
- int main() {
- ios_base::sync_with_stdio(0);
- cin.tie(0);
- int n;
- cin >> n;
- int i = 1;
- while (n >= i) {
- n -= i;
- i++;
- }
- cout << i - 1;
- return 0;
- }
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