#Problem 6
def f(current, end):
    if current > end:
        return 0
    elif current == end:
        return 1
    else:
        return f(current+2, end) + f(current+4, end) + f(current+5, end)
for i in range(32,100):
    if f(31,i)==1001:
        print(i)
        break
#56