# 15(17) РТ

for a in range(1, 1000):
    for x in range(1, 1000):
        for y in range(1, 1000):
            if ((10 * x - y + 37 != 0) or (a<x) or (a<y)) == False:
                break
        if ((10 * x - y + 37 != 0) or (a < x) or (a < y)) == False:
            break
    else:
        print(a)
# 15(17) РТ