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


int main() {
    int n,i,val=0,belo=0,prevb=0;
    char a[1000000];
    cin>>n;
    for(i=0;i<n;i++)
        cin>>a[i];
    for(i=0;i<n;i++)
        {prevb=belo;
        if(a[i]=='D')
             belo--;
        if(a[i]=='U')
            belo++;
        if(prevb==-1 && belo==0)
            val++;
        
    }
    cout<<val;
    
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */   
    return 0;
}