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#!/usr/bin/python3
def main() -> None:
with open('input', 'r') as f:
grid = tuple(tuple(x.strip()) for x in f.readlines())
xs = set()
xs.add(grid[0].index('S'))
cnt = 0
for row in grid[1:]:
for i, ch in enumerate(row):
if ch == '^' and i in xs:
cnt += 1
xs.remove(i)
xs.add(i - 1)
xs.add(i + 1)
print(cnt)
if __name__ == '__main__':
main()
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