x = input()
x = x.split(' ')
sum = 1
for i in range(1, int(x[1])+1, 1):
sum = sum%(10**9+7)*(i)
print(sum%(10**9+7))810B - Summer sell-off | 84A - Toy Army |
185A - Plant | 1749A - Cowardly Rooks |
1749C - Number Game | 1749B - Death's Blessing |
1749D - Counting Arrays | 1447B - Numbers Box |
1594D - The Number of Imposters | 984B - Minesweeper |
837A - Text Volume | 1566C - MAX-MEX Cut |
1546A - AquaMoon and Two Arrays | 897B - Chtholly's request |
1363B - Subsequence Hate | 437B - The Child and Set |
1256B - Minimize the Permutation | 733B - Parade |
172A - Phone Code | 148D - Bag of mice |
421A - Pasha and Hamsters | 1393A - Rainbow Dash Fluttershy and Chess Coloring |
980E - The Number Games | 219B - Special Offer Super Price 999 Bourles |
560B - Gerald is into Art | 322B - Ciel and Flowers |
801B - Valued Keys | 975C - Valhalla Siege |
518B - Tanya and Postcard | 514B - Han Solo and Lazer Gun |