# Enter your code here. Read input from STDIN. Print output to STDOUT
n=raw_input()
n=int(n)
way=raw_input()
height=0
count=0
for i in range(n):               
    
    if way[i]=="D":
        height-=1
    else:
        height+=1
    if height==0 and way[i]=="U":
        count+=1
print count