input()
path = input().strip()
from itertools import groupby
sub_path = groupby(path)
h = 0
res = 0
for key, value in sub_path:
    h_old = h
    if key == 'U':
        h += len(list(value))
    else:
        h -= len(list(value))
    if h_old >= 0 and h < 0:
        res += 1
print(res)