public static void main(String args[]) {
GG gg;
if (args.length != 1) System.err.println("Error. A parameter is only needed.");
else {
gg = new GG(args[0]);
gg.ejecutar();
}
}
// 396655125 big3000
// 389680576 big1201
// 363301351 big101
// 2491930 LLGLLLGGLGLG
// 302358 LLGLLLGGLGL
// 39095 LLGLLLGGLG
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
String[] _nm = scanner.nextLine().split(" ");
int n = Integer.valueOf(_nm[0]);
int m = Integer.valueOf(_nm[1]);
assert 2 <= n && n <= 3000 : "out of range, n: " + n;
assert 1 <= m && m <= 1e9 : "out of range, m: " + m;
char[] S = scanner.nextLine().toCharArray();
assert S.length == n - 1;
boolean[] G = new boolean[n - 1];
for (int i = 0; i < S.length; i++) {
G[i] = (S[i] == 'G');
}
GG o = new GG(G, n, m);
System.out.println(o.count2());
}
