#include <iostream>
using namespace std;
int main() {
int k = 999;
int i = 1;
int p = 0;
while (k > i) {
i*=2;
p++;
}
cout << p << endl;
return 0;
}
I2luY2x1ZGUgPGlvc3RyZWFtPgp1c2luZyBuYW1lc3BhY2Ugc3RkOwoKaW50IG1haW4oKSB7CglpbnQgayA9IDk5OTsKaW50IGkgPSAxOwppbnQgcCA9IDA7CndoaWxlIChrID4gaSkgewogICAgaSo9MjsKICAgIHArKzsKfQpjb3V0IDw8IHAgPDwgZW5kbDsKCXJldHVybiAwOwp9