#include <stdio.h>
int main(void) {
// your code goes here
f(0,0);
}
I2luY2x1ZGUgPHN0ZGlvLmg+CmYoYyxiKXtmb3IoYj0wO34oYz1nZXRjaGFyKCkpJiZiLSdoZWxsJ3xwdXRjaGFyKGMpLSdvJztiPWI8PDh8Yyk7fQppbnQgbWFpbih2b2lkKSB7CgkvLyB5b3VyIGNvZGUgZ29lcyBoZXJlCglmKDAsMCk7Cn0K