poj 2661 Factstone Benchmark

#include <iostream>#include <cmath>using namespace std;const int Y = 1960;int main(){    int year;    double sum;    while(cin >> year)    {        if(year == 0) break;        int tmp = pow(2*1.0,(year - Y) / 10 + 2);        int n = 2;        sum = 0;        while(sum <= tmp)        { sum += log(n*1.0) / log(2*1.0); n++;        }        cout << n - 2 << endl;    }    return 0;}