n=int(input())
l=input()
steps=[];count=0;valley=0
steps.append(0)
for i in range(len(l)):
    if(l[i]=="U"):
        count=count+1
        steps.append(count)
    else:
        count=count-1
        steps.append(count)
for j in range(n):
    if((steps[j]==0)and(steps[j+1]==-1)):
        valley=valley+1
print(valley)