#include <stdio.h>
int main(void) {
// your code goes here
int n = 0;
return 0;
}
I2luY2x1ZGUgPHN0ZGlvLmg+CgppbnQgbWFpbih2b2lkKSB7CgkvLyB5b3VyIGNvZGUgZ29lcyBoZXJlCglpbnQgbiA9IDA7CglpZihuICE9IDApIHByaW50ZigiMSIpOwoJaWYobikgcHJpbnRmKCIyIik7CglyZXR1cm4gMDsKfQo=