#include <iostream.h>
#include <string.h>
int main()
{
    int n,i;
    char s[100];
    while(cin>>n)
    {
        if(n==0) return 0;
        int max=0;
        for(i=0;i<n;i++)
        {
            gets(s);
            if(s[strlen(s)-4]=='u')
            {
                int sum=0;
                int pos=9;
                while(s[pos]>='0' && s[pos]<='9')
                sum=sum*10+s[pos]-'0';
                if(sum>max)
                max=sum;
            }
        }
        cout<<max<<endl;
    }
}       

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