#include using namespace std; #ifdef LOCAL #include "settings/debug.cpp" #define _GLIBCXX_DEBUG #else #define Debug(...) void(0) #endif using ll = long long; #define rep(i, n) for (int i = 0; i < (n); ++i) int main() { int a, b, c; cin >> a >> b >> c; if (a == b && b == c) { cout << a << endl; } else if (a == b || b == c || c == a) { cout << (a ^ b ^ c) << endl; } else { cout << (6 - a - b - c) << endl; } return 0; }