Var
A,b,c,p:integer;
Begin
Readln(a);readln(b);readln(c);
If (a>0) and (b>0) and (c>0) and (a+b>c) and (b+c>a) and (c+a)>b then
Begin
Writeln('3 canh tao thanh tam giac');
P:=a+b+c;
Writeln('chu vi=',p,' dien tich=',sqrt(p*(p-a)*(p-b)*(p-c)));
End
Else write('khong the tao thanh tam giac');
Readln
End.