n=int(input())
l=input()
sum=0
count=0
i=0
while i<n:
    if l[i]=="U":
        sum += 1
    else:
        sum -= 1
        if sum==-1:
            for j in range(i+1,n):
                if l[j]=="D":
                    sum -= 1
                else:
                    sum += 1
                    if sum==0:
                        count += 1
                        i = j
                        break
    i += 1
print(count)