conditions for multiple variables in while loop c++

Im trying to get my while loop to show "Invalid input" For a while loop for 3 variables. Im just starting out with c++ so im not the best at trying to show what i need but here it is in my terms.

while(children1,children2,children3)<1||(children1,children2,children3)>100)
 cout << "invalid input"; return 0;