#include<iostream>
#include<list>
#include<string>
#include<cstring>
#include<sstream>
#include<cctype>
#include<string.h>
#include<algorithm>
#include<cmath>
#include<stack>
#include<fstream>
#include<cstdlib>
#include<vector>
#include<map>
#include<utility>
#include<iomanip>
#include<queue>
using namespace std;
#define clr(a) memset(a,0,sizeof(a))
#define PB push_back
#define pi 3.1415926535897932384626433832795
int main()
{
long long current,money,i,j,tc,n;
string s;
//cin>>tc;
//for(i=1;i<=tc;i++)
//{
current=0;
cin>>n;
//cout<<"Case "<<i<<":"<<endl;
for(j=0;j<n;j++)
{
cin>>s;
if(s=="donate")
{
cin>>money;
current+=money;
}
else
cout<<current<<endl;
}
//}
return 0;
}
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