#include <bits/stdc++.h>
#define rep(i, n) for (int i = 0; i < (n); ++i)

using namespace std;

int main() {
    int n;
    string s;
    cin >> n >> s;
    
    int ans = 0;
    if (s[0] == '<') ans++;
    for (int i = 1; i < n; ++i) {
        if (s[i] == '<' and s[i-1] == '>') ans += 2;
    }
    
    cout << ans << '\n';
    
    return 0;
}