#include<stdio.h>
int main()
    {
    int n;
    scanf("%d",&n);
    int count=0,flag=0,ans=0;
    char a[1000000];
        scanf("%s", a);
     for(int x=0;x<n;x++)
       {
         if(a[x]=='U')
             {
            ++count;
            }
         else
             --count;
         if(count==0 && a[x]=='U')
             {
            ans++;
            }
     }
    printf("%d",ans);
}