#include <iostream>
int main()
{
    std::string str;
    size_t n,counter=0;
    int deep=0;
    bool check=false; //above sea level
    std::cin>>n>>str;
    for(size_t i=0;i<str.length();i++)
    {
        if(str[i]=='U') deep++;
        if(str[i]=='D') deep--;
        if(deep<0 && check==false) {counter++;check=true;}
        if(check==true && deep>=0) check=false;
    }
    std::cout<<counter<<"\n";
}