#include<bits/stdc++.h>
#define ll long long
using namespace std;
ll n,opt,a,b,sum,cnt,t,num;
int main()
{
    cin>>n;
    for(ll i=1;i<=n;i++) 
    {
        cin>>opt
        t--;
        if(t==0) sum+=num;
        if(opt==1) cin>>b,sum+=b;
        if(opt==2)
        {
            cin>>b;
            if(b<=sum) sum-=b;
            else cnt++;
        }
        if(opt==3)
        {
            cin>>a>>b;
            num=a;
            sum-=num;
            t=b;
        }
    }
    cout<<cnt;
    return 0;
}