#include "bits/stdc++.h"

using namespace std;

string key[]={"Ox","Tiger","Rabbit", "Dragon", "Snake", "Horse",
    "Goat", "Monkey", "Rooster", "Dog", "Pig", "Rat"};

map<string,int> M;
int main(){
    int n;cin>>n;
    for(int i=0;i<n;i++){
        string a1,t,a2,a3,a4;
        cin>>a1>>t>>t>>a2>>a3>>t>>t>>a4;
        int year=0;
        int year2=((M[a4]%12)+12)%12;
        for(int j=0;j<12;j++){
            if(key[j]==a3)
                year =j;
        }
        if(a2=="previous"){
            if(year<year2){
                int diff=year2-year;
                M[a1]=M[a4]-diff;
            } else {
                int diff=year-year2;
                M[a1]=M[a4]-12+diff;
            }
        } else {
            if(year>year2){
                int diff=year-year2;
                M[a1]=M[a4]+diff;
            } else {
                int diff=year2-year;
                M[a1]=M[a4]+12-diff;
            }
        }
    }
    cout<<abs(M["Elsie"])<<endl;
}