#include <iostream>
#include <string>
 
struct Hello{
    int a;
    Hello():a(0){}
    int world(){
        return ++a;    
    }
};
 
int main()
{
    Hello test;
	std::cout << test.world() << std::endl;
	std::cout << test.world() << std::endl;
	std::cout << test.world() << std::endl;
	std::cout << test.world() << std::endl;
}
 
				I2luY2x1ZGUgPGlvc3RyZWFtPgojaW5jbHVkZSA8c3RyaW5nPgoKc3RydWN0IEhlbGxvewogICAgaW50IGE7CiAgICBIZWxsbygpOmEoMCl7fQogICAgaW50IHdvcmxkKCl7CiAgICAgICAgcmV0dXJuICsrYTsgICAgCiAgICB9Cn07CgppbnQgbWFpbigpCnsKICAgIEhlbGxvIHRlc3Q7CglzdGQ6OmNvdXQgPDwgdGVzdC53b3JsZCgpIDw8IHN0ZDo6ZW5kbDsKCXN0ZDo6Y291dCA8PCB0ZXN0LndvcmxkKCkgPDwgc3RkOjplbmRsOwoJc3RkOjpjb3V0IDw8IHRlc3Qud29ybGQoKSA8PCBzdGQ6OmVuZGw7CglzdGQ6OmNvdXQgPDwgdGVzdC53b3JsZCgpIDw8IHN0ZDo6ZW5kbDsKfQo=