#include <stdio.h>

 #include <string.h>

 #include <iostream>

 using namespace std;

 char str[];

 const int maxn=;

 int main(){

     int n;

     //freopen("C:\\Users\\acm\\Desktop\\2015Beijing\\in.txt","r",stdin);

     while(scanf("%d",&n)!=EOF){

         int cnt=,x;

         for(int i=;i<=n;i++){

             scanf("%s",str);

             if(str[]=='S') cnt++;

             else {

                 scanf("%d",&x);

                 if(x==) cnt++;

             }

         }

         printf("%d\n",cnt);

     }

     return ;

 }