def calc(a,b):
	ans=a*b
	if -99999999 > ans or 99999999 < ans:
		print('E')
	else:
		print(int(ans))

def mental(a,b):
	ans=(a*b)/10
	print(int(ans))

if __name__ == '__main__':
	a,b=input().split(' ')
	if int(a)%10==0 and int(b)%10==0:
			mental(int(a),int(b))
	else:
		calc(int(a),int(b))