#trace the program for the following inputs. Write the final output. Explain for this 
#program is doing
# Input 1: 41 6 78 21
# Input 2: 2 6 8 10

def main():
	i=1
	p=1
	while(i<=4):
		n=int(input("enter number "))
		if(n%2==0):
			p=p*n
		i=i+1
	if(p==1):
		print("nothing calculated")
	else:
		print("p=", p)

main()