#include <iostream>
#include <algorithm>
double add(std::initializer_list<double> l) {
return std::accumulate(l.begin(), l.end(), 0.0);
}
int main() {
double ans = add({1.5, 2.5});
std::cout << ans << std::endl;
return 0;
}
I2luY2x1ZGUgPGlvc3RyZWFtPgojaW5jbHVkZSA8YWxnb3JpdGhtPgoKZG91YmxlIGFkZChzdGQ6OmluaXRpYWxpemVyX2xpc3Q8ZG91YmxlPiBsKSB7CiAgcmV0dXJuIHN0ZDo6YWNjdW11bGF0ZShsLmJlZ2luKCksIGwuZW5kKCksIDAuMCk7Cn0KCmludCBtYWluKCkgewogIGRvdWJsZSBhbnMgPSBhZGQoezEuNSwgMi41fSk7CiAgc3RkOjpjb3V0IDw8IGFucyA8PCBzdGQ6OmVuZGw7CiAgcmV0dXJuIDA7Cn0K