#include <iostream>
#include <fstream>
using namespace std;
int V[10];
// Declaring functions
void aggiungi(long long int id,int V[]) {
V[id]=V[id]+1;
}
void togli(long long int id,int V[]) {
V[id]=V[id]-1;
}
int conta(long long int id,int V[]) {
return V[id];
}
int main() {
ios::sync_with_stdio(false);
// Uncomment the following lines if you want to read/write from files
// ifstream cin("input.txt");
// ofstream cout("output.txt");
int Q;
cin >> Q;
for(int i = 0; i < Q; i++){
char t;
long long int id;
cin >> t >> id;
if(t == 'a') {
aggiungi(id,V);
} else if (t == 't') {
togli(id,V);
} else if (t == 'c') {
cout << conta(id,V) << '\n';
}
}
return 0;
}
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