UVa 11636 你好 世界！（贪心）

#include<iostream>
#include<algorithm>
#include<string>
using namespace std;

const int maxn = 50 + 5;

int n;

int main()
{
ios::sync_with_stdio(false);
//freopen("D:\\txt.txt", "r", stdin);
int kase = 0;
while (cin >> n && n >=0)
{
int num = 1;
int cnt = 0;
while (true)
{
if (num >= n)
break;
num *= 2;
cnt++;
}
cout << "Case " << ++kase << ": " << cnt << endl;
}
}