# Enter your code here. Read input from STDIN. Print output to STDOUT
n = int(input())
steps = raw_input()

h=0
v=0
count=0
for c in steps:
    if c == "U":
        h+=1
    else:
        h-=1
    
    if h<0 and v == 0:
        count+=1
        v=1
    
    if h>=0:
        v = 0
        
print count