# Enter your code here. Read input from STDIN. Print output to STDOUT
import sys
n = sys.stdin.readline()
s = sys.stdin.readline()
lvl = 0 #sealvl
vals = 0
for i in range(0,len(s)):
    if s[i] == 'D' and lvl == 0:
        vals = vals + 1
    if s[i] == 'U':
        lvl = lvl + 1
    elif s[i] == 'D':
        lvl = lvl - 1
        
print vals