#include<stdio.h>

int main()
{
    long int n,i,cost=0,count=0;
    char str[1000000];
    scanf("%ld",&n);
    scanf("%s",str);
    for(i=0;str[i]!='\0';)
    {
        if(str[i]=='D')
        {

            cost=-1;
            i++;
            while(i<n&&cost!=0)
            {
                if(str[i]=='D')
                    cost-=1;
                else
                    cost+=1;
                i++;
            }
            if(cost==0)
                count++;
        }
        else
        {

            cost=1;
            i++;
            while(i<n&&cost!=0)
            {
                if(str[i]=='D')
                    cost-=1;
                else
                    cost+=1;
                i++;
            }
        }
    }
    printf("%ld\n",count);
    return 0;
}