#include<cstdio>
#include<cstring>
#include<cmath>
#include<algorithm>
using namespace std; char num[];
char s[];
int week[]; int main()
{
week[]=;
week[]=;
week[]=;
week[]=;
week[]=;
week[]=;
week[]=; scanf("%s",num);
scanf("%s",s);
scanf("%s",s);
int ans=;
int n=;
for(int i=;num[i];i++) n=n*+num[i]-''; if(s[]=='w') ans=+week[n]; else{
if(n<=) ans=;
else if(n<=) ans=;
else ans=;
}
printf("%d\n",ans);
return ;
}