171223_1547_공

//https://www.acmicpc.net/problem/1547 #include <iostream>

using namespace std;

int main()

{

int m;

bool cup[4]={0,1,0,0};

cin >> m;

for(int i=0 ;i<m; i++)

{

int x,y;

cin >> x >> y;

int tmp=cup[x];

cup[x]=cup[y];

cup[y]=tmp;

}

for(int i=1; i<=3; i++)

if(cup[i]) cout << i << endl;

}