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#include <algorithm>
#include <map>
#include <iostream>
#define mix1(x) (x * 1)
#define mix2(x) (x * 2)
#define mix(i, x) mix ## i(x)
int main()
{
std::cout << mix(1, 1000) << std::endl;
std::cout << mix(2, 1000000) << std::endl;
}
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g++ -std=c++17 -O2 -Wall -pedantic -pthread main.cpp && ./a.out

1000
2000000