문제
풀이
#include <iostream>
using namespace std;
void solve(void) {
int n; cin >> n;
int cur = 0, ans = 0;
while (cur <= n) {
cur += (ans+1) * (ans+1) + ans * ans;
ans++;
}
cout << ans - 1;
}
int main(void) {
ios::sync_with_stdio(false);
cin.tie(nullptr);
solve();
return 0;
}