#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;


int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */   
    //Input
    int N; //Number of steps
    string height; //Amount above sea level
    vector<int> heights {0}; //I'm going to store my heights above sea level here
    cin >> N;
    string U = "U";
    for (int i=0; i<N; i++) {
        cin >> height;
        if (height[i] == U[0]) {
            heights.push_back(heights[i]+1);
        }
        else {
            heights.push_back(heights[i]-1);
        }
    }
    
    //Algorithm - number of valleys = number of -1s divided by 2 lol. WHOOPS FAIL. 
    //number of valleys = number of -1's followed by 0's etc.
    int valleyNumber = 0;
    bool valleyStarted = false;
    for (int i=0; i<N+1; i++) {
        if (heights[i] == -1) {
            valleyStarted = true;
        }
        if (heights[i] == 0 && valleyStarted == true) {
            valleyNumber += 1;
            valleyStarted = false; //The valley just ended
        }
    }
    //Output
    cout << valleyNumber;
    return 0;
}