#include<bits/stdc++.h>
using namespace std;
string h(string a){
	string b;
	for(int i=a.size()-1;i>=0;i--){
		b+=a[i];
	}
	return b;
}
double mb;
int main(){
	int j;
	cin>>j;
	for(int i=0;i<j;i++){
		int n=4;
		string g;
		cin>>g;
		if(g=="long"){
			cin>>g;
			n=8;
		}
		cin>>g;
		string num;
		int numt=0;
		bool k=0;
		for(int i=0;i<g.size();i++){
			if(g[i]==']'){
				k=0;
			}
			if(k)num+=g[i];
			if(g[i]=='['){
				k=1;
			}
		}
		for(int i=0;i<num.size();i++){
			numt=numt*10+num[i]-'0';
		}
		long long kb=(long long)numt*(long long)n;
		mb+=(double)kb/(double)1024/(double)1024;
	}
	cout<<(floor(mb)==mb?mb:floor(mb)+1);
}