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#include <fstream>
#include <unordered_map>
using namespace std;
ifstream f("hashuri.in");
ofstream g("hashuri.out");
int n;
unordered_map<int, int> fr;
int main()
{
f >> n;
for(int i = 1; i <= n; i ++)
{
int tip, x; f >> tip >> x;
if(tip == 1)
fr[x] = 1;
else if(tip == 2)
fr[x] = 0;
else
g << fr[x] << '\n';
}
return 0;
}