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21 lines
402 B
C++

#define _CRT_SECURE_NO_WARNINGS
#define _SILENCE_CXX17_C_HEADER_DEPRECATION_WARNING
#include <bits/stdc++.h>
using namespace std;
int main()
{
double target, cur = 2, sum = 0;
cin >> target;
for (int i = 1;; i++)
{
sum += cur;
cur *= 0.98;
if (sum > target)
{
cout << i;
break;
}
}
return 0;
}