ACM (UVa) : 11636


#include <stdio.h>
#include <math.h>

int main ()
{
    int n;
    int cases = 0;

    while ( scanf ("%d", &n) && n >= 0 ) {
        printf ("Case %d: %0.lf\n", ++cases, ceil (log (n) / log (2)));
    }

    return 0;
}

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