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

n = int(raw_input().strip())
steps = map(str,raw_input().strip())

pos = 0
valley = 0
for i in steps:
    if pos == 0 and i == 'D':
        valley += 1
    if i == 'D':
        pos = pos - 1
    elif i == 'U':
        pos = pos + 1
        
print valley