#include <iostream>
using namespace std;
int main() {
int a , b;
cin >> b;
a = b / 10;
cout << a;
return 0;
}
I2luY2x1ZGUgPGlvc3RyZWFtPgp1c2luZyBuYW1lc3BhY2Ugc3RkOwoKaW50IG1haW4oKSB7CglpbnQgYSAsIGI7CgljaW4gPj4gYjsKCWEgPSBiIC8gMTA7Cgljb3V0IDw8IGE7CglyZXR1cm4gMDsKfQ==