11636 - Hello World, uva

#include <iostream>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <ctime>
#include <vector>
#include <stdio.h>
#define db(a) \
cout << #a << " = " << a << endl
#define db2(a, b) \
cout << #a << " = " << a << " " << #b << " = " << b << endl
#define inf (1<<30)
using namespace std;
int lista[10001];
int main() {
 #ifdef dennisbot
  freopen("in.in", "r", stdin);
 #endif
 int seed = 1, cont = 0, t = 1;
 for (int i = 1; i < 10001; i++) {
  if (seed >= i) {
   lista[i] = cont;
  }
  else {
   while (seed *= 2, cont++, seed < i);
   lista[i] = cont;
  }
 }
 int n;
 while (scanf("%d", &n) != EOF && n > 0) {
  printf("Case %d: %d\n", t++, lista[n]); 
 }
    return 0;
}