#include<iostream>
int main() {
if ( __cplusplus == 202101L) std::cout << "C++23";
else if (__cplusplus == 202002L) std::cout << "C++20";
else if (__cplusplus == 201703L) std::cout << "C++17";
else if (__cplusplus == 201402L) std::cout << "C++14";
else if (__cplusplus == 201103L) std::cout << "C++11";
else if (__cplusplus == 199711L) std::cout << "C++98";
else std::cout << "__cplusplus: " << __cplusplus;
std::cout << std::endl;
}
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