#include<iostream>
using namespace std;
int main(){
	long long m,temp,tmp;
	cin>>m;
	long long t,a=1,money=0,cnt=0,cun[10000005]={},b=-1,b1=0;
	for(long long i=1;i<=m;i++){
		money+=cun[i];
		cin>>t; 
		if(t==1){
			cin>>temp;
			money+=temp;
		}
		else if(t==2){
			cin>>temp;
			if(temp>money) cnt++;
			else money-=temp;
		}
		else if(t==3){
			cin>>tmp>>temp;
			cun[temp]=tmp;
			money-=tmp;
		}
	}
	cout<<cnt;
	return 0;
}