1043

A,B,C = input().split()
A = float(A)
B = float(B)
C = float(C)
if A + B > C and A + C > B and B + C > A :
    keliling = A + B + C
    print("Perimetro = %.1f"%keliling)
else :
    luas = ((A+B)*C)/2
    print("Area = %.1f"%luas)