#include <iostream>

int main()

{

    std::cout << "请输入三个数字,以空格分隔，按回车键结束：" << std::endl;

    int a = , b = , c = ;

    std::cin >> a >> b >> c;

    std::cout << a << " + " << b << " + " << c

    << " = "<< a + b + c << std::endl;

    return ;

}