#include <stdio.h>
int main( int argc , char * argv[] ) {
int n,i;
scanf("%d" , &n);
while ( n != 0 ) {
int pow = 1;
for ( i = 0 ; i <= n ; i++ ) {
if ( pow > n ) {
printf("%d\n" , i-1);
break;
}
pow = pow * 2;
}
scanf("%d" , &n);
}
return 0;
}
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