using namespace std;
#include <bits/stdc++.h>
#define BEGIN ios_base::sync_with_stdio(0);cin.tie(0);
#define END return EXIT_SUCCESS;
#define FOR(I,A,B) for(int (I)=(A);(I)<(B);++(I))
#define ALL(C) (C).begin(),(C).end()
void solve()
{
	int N;cin>>N;
	int A=~0;
	while(N--)
	{
		int M=0;
		int T=0;
		string S;
		FOR(i,0,4)
		{
			cin>>M;
			T|=1<<M;
		}
		cin>>S;
		if(S=="YES")A&=T;
		if(S=="NO")A&=~T;
	}
	A^=(~0<<10);
	FOR(i,0,10)
	{
		if(A&1){cout<<i<<endl;break;}
		else A>>=1;
	}
}
int main(int argc,char**argv)
{
	BEGIN
	solve();
	END
}