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#include<bits/stdc++.h>
int main()
{
    int i,n;
    double a,b,c,d;
    char s[10],t[10];
    scanf("%d",&n);
    a=b=c=d=0;
    for(i=0;i<n;i++){
        scanf("%s %s",&s,&t);
        if(s[0]=='+' && t[0]=='+')a++;else
        if(s[0]=='+' && t[0]=='-')b++;else
        if(s[0]=='-' && t[0]=='+')c++;else
        d++;
    }
    printf("%.2f%%\n",(200*a/(2*a+b+c)));
    return 0;
}
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