#include <bits/stdc++.h>
using namespace std;
int main() {
  long long n;
  while (cin >> n) {
    string x;
    cin >> x;
    long long c = 0;
    long long arr[n + 5];
    memset(arr, 0, sizeof(arr));
    for (long long i = 0; i < n; i++) {
      if (x[i] == '<') {
        if ((i - 1) < 0 || arr[i - 1] == 1) arr[i] = 1;
      } else if (x[i] == '>') {
        long long lft = i;
        while (i < n && x[i] == '>') i++;
        if (i >= n) {
          long long rgt = i;
          c += (rgt - lft);
        } else
          i--;
      }
    }
    for (long long i = 0; i < n; i++)
      if (arr[i] == 1) c++;
    cout << c << endl;
  }
  return 0;
}
