this night was not easy Vasya his favorite team lose do not find victorious play perfectly teammate let time he win time losestreak grow long long its wonder do not sleep night allIn morning Vasya wait bus university bus stop Vasyas thought hazy could not remember right bus number right get bus number nin bus Vasya think order digits number bus wrong Futhermore digit time digit see definitely real number bus for example Vasya see number 2028 mean real bus number 2028 8022 2820 820 however number 80 22208 52 definitely could not number bus also real bus number could not start digit 0 mean example number 082 could not real bus number tooGiven n determine total number possible bus number variant