import itertools
rocks = [
    0b00011110,
    0b00001000_00011100_00001000,
    0b00000100_00000100_00011100,
    0b00010000_00010000_00010000_00010000,
    0b00011000_00011000,
]

jets = itertools.cycle(">>><<><>><<<>><>>><<<>>><<<><<<>><>><<>>")
jets = itertools.cycle(open("input").read().strip())

rocki = itertools.cycle(rocks)

a = 0b11111111
wall = 0b10000000_10000000_10000000_10000000_10000000
stopped = 0
r = 0
while stopped < 2022:
    if r == 0:
        # start falling
        r = next(rocki)
        h = a.bit_length() + 8*3
        if h % 8 != 0:
            h += 8 - h%8
        #for i in reversed(range(0,a.bit_length(),8)):
        #    print("{:08b}".format((a>>i)&0xff))
        #print()
    else:
        # continue falling?
        if r & (a>>(h-8)) == 0:
            h -= 8
        else:
            # stop
            a |= (r<<h)
            r = 0
            stopped += 1
            continue

    j = next(jets)
    if j == '<':
        x = (r<<1)
        if x & wall == 0:
            if x & (a>>h) == 0:
                r = x
    elif j == '>':
        x = (r<<7)
        if x & wall == 0:
            x >>= 8
            if x & (a>>h) == 0:
                r = x

import math
print(math.ceil((a>>8).bit_length()/8))