#include <iostream>
using namespace std;
int main() {
int ans = 0;
for (int i=1011; i>=1; i-=2) {
if (i%1011 == 0) ans += 1011;
else if (i%674 == 0) ans += 674;
else if (i%337 == 0) ans += 337;
else if (i%6 == 0) ans += 6;
else if (i%3 == 0) ans += 3;
else if (i%2 == 0) ans += 2;
else ans++;
}
cout << ans*2 << endl;
}
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