# Enter your code here. Read input from STDIN. Print output to STDOUT
n = int(raw_input().strip())
arr = raw_input().strip()
length = len(arr)
count = 0
ups= 0
downs = 0
level = 0
arr.split()
for i in range(0,length,1):
    if arr[i] == "D":
        downs = downs+1
        level = level -1
    elif arr[i] == "U":
        ups = ups+1
        level = level + 1
    if (arr[i]=="U" and level == 0):
        count = count + 1
    i=i+1
print count