#include <iostream> #include <vector> #include <algorithm> using namespace std; int main(){ vector<int> A(3); for(int i = 0; 3 > i; i++){ cin>>A[i]; } sort(A.begin(),A.end()); if(A[0] == A[2]){ cout << A[0] << endl; }else if(A[0] == A[1]){ cout << A[2] << endl; }else if(A[1] == A[2]){ cout << A[0] << endl; }else{ cout << 6-A[0]-A[1]-A[2] << endl; } }