#include <bits/stdc++.h>
using namespace std;
char c[200010];
int main() {
  int n;
  while (scanf("%d", &n) != EOF) {
    memset(c, 0, sizeof c);
    scanf("%s", c);
    int ans = 0;
    for (int i = 0; i < n; i++) {
      if (c[i] == '<')
        ans++;
      else
        break;
    }
    for (int i = n - 1; i >= 0; i--) {
      if (c[i] == '>')
        ans++;
      else
        break;
    }
    printf("%d\n", ans);
  }
  return 0;
}
