ACM 11636 - Hello World!

#include <stdio.h>
#include <math.h>
int main()
{
    int n, j = 0;
    while (scanf("%d", &n) && n > 0 )
        if (n != 1) printf("Case %d: %d\n", ++ j, (int)ceil(log((double)n)/log(2)));
        else printf("Case %d: 0\n", ++ j) ;
    return 0;
}

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