#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;

void printvalley(string steps){
    int mt = 0, v = 0, count_m = 0, count_v = 0, first = 0;
    for(int i = 0; i < steps.length(); i ++){

        if(mt == 0 && v == 0){
            if(steps[i] == 'U'){
                mt ++;
            }
            else {
                v--;
            }
        }
        else if(steps[i] == 'U'){
            if(mt > 0)
                mt++;
            else if(v<0){
                v++;
                if( v == 0)
                    count_v ++;
            }
        }
        else if (steps[i] == 'D'){
            if(mt > 0)
                mt--;
            if(v<0)
                v--;
        }
      
    }
    cout<<count_v;
}
int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */ 
    int numberOfSteps;
    cin>>numberOfSteps;
    string steps;
    for(int i = 0;i < numberOfSteps; i++){
        cin>>steps;
    }
    printvalley(steps);
    return 0;
}