#include <iostream>
#include <cstring>
#include <algorithm>
using namespace std;
int main()
{
int n;
cin >> n;
string a;
cin >> a;
int res = 0;
for(int i = 0; i < a.size(); i ++)
{
if(a[i] == '<')
res ++;
if(a[i] == '>')
break;
}
for(int i = a.size() - 1; i >= 0; i --)
{
if(a[i] == '>')
res ++;
if(a[i] == '<')
break;
}
cout << res << endl;
return 0;
}