#include <iostream>
#include <string>

using namespace std;

int main () {
    int N; cin >> N;
    string S; cin >> S;

    int ans = 0;
    int state = 0;
    for (auto c : S) {
        if (c == '>') {
            if (0 <= state) {
                state = -1;
                ans++;
            }
        }

        if (c == '<') {
            if (state <= 0) {
                state = 1;
                ans++;
            }
        }
    }

    cout << ans << "\n";

    return 0;
}