#include <iostream>
int main()
{
int a=0, x=0;
do{
std::cin>>a;
x+=a;
}while(a!=0);
std::cout<<x;
}
I2luY2x1ZGUgPGlvc3RyZWFtPgoKaW50IG1haW4oKQp7CmludCBhPTAsIHg9MDsKICAgIGRvewogICAgICAgc3RkOjpjaW4+PmE7CiAgICAgICB4Kz1hOwogICAgICB9d2hpbGUoYSE9MCk7CiAgICBzdGQ6OmNvdXQ8PHg7Cn0=