n = int(input())
s = input().lower()
mar = 0
v = 0
i = 0
a = 0

for step in s:
    if step == 'u':
        i += 1
    else:
        i -= 1
    if i < mar and a == 0:
        v += 1
        a = 1
    elif i >= mar:
        a = 0

print(v)