#include <stdio.h>
main(){
double count=0,sum=0,data;
while(scanf("%lf",&data
)!=EOF
){ sum+=data;
count++;
}
}
I2luY2x1ZGUgPHN0ZGlvLmg+CgptYWluKCl7Cglkb3VibGUgY291bnQ9MCxzdW09MCxkYXRhOwoJd2hpbGUoc2NhbmYoIiVsZiIsJmRhdGEpIT1FT0YpewoJCXN1bSs9ZGF0YTsKCQljb3VudCsrOwoJfQkKCXByaW50ZigiJWYiLHN1bS9jb3VudCk7Cn0K