Kretki: A computer game has 27 characters in a guild. On the journey to
The underground character can perform the role of a tank, fighter or doctor. one
The character in the guild can be both a tank, and a fighter, and a doctor. Thirteen
Characters can be tanks. Twelve characters can be doctors.
Fourteen can be fighters. Both a tank and a doctor can be seven. and
One tank and five soldiers. A doctor and a soldier are four. How many characters
Could they be fighters?(The task of computer science)