#!/bin/python3

import sys


n = int(input().strip())
s=input('')
l=[]
l.append(0)
s_l=0
l1=[]
temp=[]
c_v=0
for i in s:
    if(i=='U'):
        s_l+=1
    else:
        s_l-=1
    #print(s_l)
    l.append(s_l)
for i in range(0,len(l)):
    if(l[i]==0):
        l1.append(i)
        #print(i)
#print(l1)
for i in range(0,len(l1)-1):
    #for j in range(0,len(l)):
    temp=l[l1[i]:l1[i+1]]
        
    if(all(i<=0 for i in temp)):
        #print('ok')
        c_v+=1
        #print(l[i:])

#for i in l1:
    #for j in range(0,len(l)):
    #print(l[:i])


#print(l)

print(c_v)