Scanner sc = new Scanner(System.in)
int n = sc.nextInt()

String s = sc.next()

int countV = 0
int previousLevel = 0
int level = 0
for(char c : s.toCharArray()){
    previousLevel = level
    if(c == ((char)'U')){
        level++;
    } else {
        level--;
    }
    if(previousLevel >= 0 && level < 0){
        countV++
    }
}

println countV