import random
import time

print "Enter 0 to stop."

count = 0
correct_count = 0
start = time.time()
while True:
	m = random.randint(1,100)
	n = random.randint(1,100)
	s = str(m) + " x " + str(n)
	ans = int(raw_input(s + "\n"))
	total_time = time.time() - start

	
	if ans == 0:
		print count, " problems"
		print correct_count, " correct"
		print "Accuracy: ",  (1.0*correct_count/count)
		print "Total time: ", total_time
		print "Average time: ", (1.0*total_time)/count
		break
	
	elif ans == (m*n):
		print "Correct."
		count += 1
		correct_count += 1
	
	else:
		print "Incorrect: ", s, "=", str(m*n)
		count += 1