n = int(input())
steps = input()
level = 0
valleys = 0
height = []

for step in steps:
    if step == 'U':
        level += 1
    elif step == 'D':
        level -= 1
    height.append(level)
for x in range(1, len(height)):
    if height[x-1] < 0 and height[x] == 0:
        valleys += 1
print(valleys)