And this code time limits (no matter with or without Psyco): import psyco psyco.full() import sys def foo(): ##sys.stdin = open('D:/1583.txt', 'rt') sys.stdin.readline() while 1: try: x, y = sys.stdin.readline().split() sys.stdout.write(str(int(x) * int(y)) + '\n') except: break foo()