#include <iostream>
#include <string>
using namespace std;
int main() {
string a;
cin >> a;
int aback= a.back()-'0';
cout << aback ;
return 0;
}
I2luY2x1ZGUgPGlvc3RyZWFtPgojaW5jbHVkZSA8c3RyaW5nPgp1c2luZyBuYW1lc3BhY2Ugc3RkOwppbnQgbWFpbigpIHsKCXN0cmluZyBhOwoJY2luID4+IGE7CmludCBhYmFjaz0gYS5iYWNrKCktJzAnOwpjb3V0IDw8IGFiYWNrIDsKCXJldHVybiAwOwp9