num = input()
string = input()
list1 = list(string)
def mon(num,list1):
    key = 0
    count = 0
    list2 = [0]
    new_list = []
    list3 = []
    for i in list1:
        if i == "D":
            key = key - 1
            new_list += [key]
        if i == "U":
            key = key + 1
            new_list += [key]
            
    for a in new_list:
        if a <= 0:
            list2 += [a]
            
        
    for b in range(len(list2) - 1):
        if list2[b] == 0 and list2[b+1] < 0:
            count += 1
    return count          
       
            
        
  
  
    
print(mon(num,list1))