# Enter your code here. Read input from STDIN. Print output to STDOUT
import sys

n = int(sys.stdin.readline().strip())
data = list(sys.stdin.readline().strip())

level = 0
valleys = 0

for step in data:
    if step == 'U':
        level += 1
        if level == 0:
            valleys += 1
    if step == 'D':
        level -= 1

print valleys