from functools import reduce
from collections import defaultdict
d = defaultdict(int)
d[(0, 0)] = 1
def reducer(state, move):
    d, pos = state
    npos = (pos[0] + move[0], pos[1] + move[1])
    d[npos] += 1
    return (d, (npos))
print(len(reduce(reducer, ({'^': (0, 1), 'v': (0, -1), '>': (1, 0), '<': (-1, 0)}[c] for c in open('input').read().rstrip('\n')), (d, (0, 0)))[0]))