first =input()
second=input()
count_1 =0
count_2 =0
below_sea = False
for element in range(0,len(second)):
    if second[element] == "U":
        count_1 += 1
        
    if second[element] == "D":
        count_1 -=1
        
    
    if count_1 < 0:
        if not below_sea :
            count_2 +=1
            below_sea = True
    else:
        below_sea =False
print(count_2)