def area(r):
    area=3.14*r**2
    return area

n=int(input("radius="))
r=area(n) 
print("area=",r,"cm2") 
  
def area(r):
    area=3.14*r**2
    return area

n=int(input("radius="))
r=area(n) 
print("area=",r,"cm2") 
  