#include <iostream>

int main()
{
	int total = 0;
	for (int x = 0; x < 1000; x+= 3)
	{
		total += x;
	}
	for (int y =0; y < 1000; y+= 5)
	{
		total += y;
	}
	std::cout << total << std::endl;
}

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