#include<iostream>
#include<fstream>
using namespace std;
ifstream f("hashuri.in");
ofstream g("hashuri.out");
short a[250000000];
long long nr,op,q;
long n,i;
int main()
{f>>n;
for(i=1;i<=n;i++)
	{f>>op>>nr;
		if(op==1)
		{if(nr<=250000000)
			a[nr]=a[nr]+1;
		if( nr>250000000 && nr<=500000000 )
			a[nr-250000000]=a[nr-250000000]+10;
		if(nr>500000000 && nr<=750000000)
		    a[nr-500000000]=a[nr-500000000]+100;		
		if(nr>750000000 && nr<=1000000000)
			a[nr-750000000]=a[nr-750000000]+1000;
		}
		if(op==2)
		{if(nr<=250000000)
			a[nr]=a[nr]-1;
		if( nr>250000000 && nr<=500000000 )
			a[nr-250000000]=a[nr-250000000]-10;
		if(nr>500000000 && nr<=750000000)
		    a[nr-500000000]=a[nr-500000000]-100;		
		if(nr>750000000 && nr<=1000000000)
			a[nr-750000000]=a[nr-750000000]-1000;
		}
		if(op==3)
		{if(nr<=250000000)
			g<<a[nr]%10<<'\n';
		if( nr>250000000 && nr<=500000000 )
			g<<(a[nr-250000000]/10)%10<<'\n';
		if(nr>500000000 && nr<=750000000)
		    g<<(a[nr-500000000]/100)%10<<'\n';		
		if(nr>750000000 && nr<=1000000000)
			g<<(a[nr-750000000])/1000<<'\n';
		}
	}
}