var a,b,c:longint;
p,s:real;
begin
write('Nhap vao 3 so a b c = ');readln(a,b,c);
if (a+b>c) and (b+c>a) and (a+c>b) then
begin
p := (a+b+c)/2;
s := sqrt(p*(p-a)*(p-b)*(p-c));
writeln('Chu vi = ',2*p:0:2);
writeln('Dien tich = ',s:0:2);
end
else write('Do dai khong hop le');
readln;
end.