#include<iostream>
#include<cstdio>
using namespace std;
int main()
{
    int n,valley=0,i,hike=0,flag;
    cin>>n;
    char step[n+1];
    scanf("%s",step);
    for(i=0;i<n;i++)
    {
        if(hike==-1)
        {
            flag=1;
        }
        else
        {
            flag=0;
        }
        if(step[i]=='U')
        {
            hike++;
        }
        else if(step[i]=='D')
        {
            hike--;
        }
        if(hike==0 && flag==1)
        {
            valley++;
        }
    }
    cout<<valley;
    return 0;
}