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

def drop(a, r, jets):
    # start falling
    h = a.bit_length() + 8*3
    if h % 8 != 0:
        h += 8 - h%8
    while True:
        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

        # continue falling?
        if r & (a>>(h-8)) == 0:
            h -= 8
            assert h > 0
        else:
            # stop
            a |= (r<<h)
            return a


a = 0b11111111
wall = 0b10000000_10000000_10000000_10000000_10000000
stopped = 0
while stopped < 2022:
    r = next(rocki)
    a = drop(a,r,jets)
    stopped += 1
    #for i in reversed(range(0,a.bit_length(),8)):
    #    print("{:08b}".format((a>>i)&0xff))
    #print()

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