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#include <iostream>
using namespace std;
int main()
{
const int N = 1000;
int sum = 0;
for (int i = 0; i < N; ++i) {
if (i % 3 == 0 || i % 5 == 0) {
sum += i;
}
}
cout << "Sum: " << sum << endl;
return 0;
}