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

n = int(raw_input().strip())
pattern = raw_input().strip()

count = 0
ptr = [0]

for i in range(n):
    if pattern[i] == 'U':
        ptr.append(ptr[i] + 1)
    else:
        ptr.append(ptr[i] - 1)
        
    if ptr[i] == 0 and ptr[i+1] <0:
        count += 1
        
print count