#include <bits/stdc++.h>
#include <thread>
# include <mutex>
#define int long long
using namespace std;
int ans=0;
mutex m;
void fun(int n){
for(int i=0;i<n;i++){
m.lock();
ans++;
m.unlock();
}
}
int32_t main() {
thread t(fun,1000000);
thread t2(fun,1000000);
cout<<ans<<endl;
t.join();
t2.join();
cout<<ans<<endl;
}
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