#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 */   
    int n,u=0,d=0,count=0,i,t=0;
    char arr[1000000];
    cin>>n;
    for(i=0;i<n;i++)
        cin>>arr[i];
    for(i=0;i<n;i++)
        {
        if(arr[i]=='U')
            u++;
        if(arr[i]=='D')
            d++;
        if(d>u && t==0)
            {
            count++;
            t=1;
        }
        else if(d==u)
            {
            t=0;
        }
    }
    cout<<count;
    return 0;
}