floor log2 by 

package main

import (
\x09"fmt"
\x09"math/bits"
)

func main() {
\x09var x uint64
\x09var e error
\x09for {
\x09\x09_, e = fmt.Scanln(&x)
\x09\x09if e != nil {
\x09\x09\x09break
\x09\x09}
\x09\x09fmt.Println(bits.Len64(x) - 1)
\x09}
}

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