with open(r'day7/input.txt', 'r') as input:
    lines = input.read().split('\n')[:-1]

active = set([lines[0].index('S')])

split_cnt = 0

for line in lines[1:]:
    active_buf = set()
    for i in active:
        if line[i] == '^':
            if i > 0:
                active_buf.add(i-1) 
            if i < len(line) -1:
                active_buf.add(i+1)
            split_cnt+=1
        else:
            active_buf.add(i)
    active = active_buf


print(split_cnt)