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


int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */   
    int num_of_cases;
    string steps;
    cin>>num_of_cases>>steps;
   
    int level = 0;
    int num_of_valleys = 0;
    bool inValy = 0;
    int priv_level = 0;
    
    for(int i = 0; i < num_of_cases; i++)
    {
        if(steps[i] == 'U')
        {
            priv_level = level;
            level++;
        }
        else if(steps[i] == 'D')
        {
            priv_level = level;
            level--;    
        }
        
        if(level < 0)
        {
            inValy = 1;
            
        }
        else if(level>0)
        {
            inValy = 0;
        }
        
        if((level == 0) & (priv_level == -1))
        {
            num_of_valleys++;
        }
    }
    
    cout<<num_of_valleys;
    return 0;
}