Untitled

#include <iostream>
#include <queue>
#include <algorithm>
using namespace std;
const int maxn = 100005;

int main()
{
    int n;
    cin >> n;
    int brojac = 0;
    long long rez = 0;
    for(int i = 0; i < n; i++) {
        string s;
        cin >> s;
        if(s == "LL") {
            brojac += 1;
        }
        if(s == "DD") {
            brojac -= 1;
        }
        rez += abs(brojac);
    }
    cout << rez << endl;
    return 0;
}

/*
 DD -1  brojac + 1
 DD -2 brojac + 1
 LL -1 brojac + 1
 LL 0 brojac + 0
 */