# Enter your code here. Read input from STDIN. Print output to STDOUT
n = int(raw_input())
steps = raw_input()
level = 0
sum = 0
for i in range(n):
    if steps[i] == "U":
        level += 1
        if level == 0: sum += 1
    elif steps[i] == "D":
        level -= 1
print sum