uva 10916 - Factstone Benchmark

#include<iostream>
#include<cstdio>
#include<cmath>
using namespace std;
int main()
{
int n,i;
double m,sum;
while (cin>>n&&n)
{
m=pow(2,(n-1940)/10)*log(2);
sum=0;
for (i=1; sum<m; i++)
sum+=log(i);
cout<<i-2<<endl;
}
return 0;
}