#include <stdio.h>
#include <stdint.h>
 
uint32_t log2(uint32_t n)
{
    float f = n;
    return (*reinterpret_cast<uint32_t *>(&f) >> 23) - 127;
}
 
int main()
{
    uint32_t n;
    while(scanf("%u", &n) == 1)
    {
        printf("%u\n", log2(n));
    };
    return 0;
}