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#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;
int main() {
vector<int> v;
int last = 5;
v.push_back(0);
v.push_back(1);
v.push_back(3);
v.push_back(5);
for (int i = 4; true; i++) {
int res = lower_bound(v.begin(), v.end(), i) - v.begin();
last += res;
v.push_back(last);
if (last > 2000000000) break;
}
int n;
while (cin >> n && n != 0) {
int res = lower_bound(v.begin(), v.end(), n) - v.begin();
printf("%d\n", res);
}
return 0;
}
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