#include <bits/stdc++.h>
using namespace std;
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace __gnu_pbds;
#define M 1000000007
#define M2 998244353
#define ll long long
#define pll pair<long,long>
#define REP(i,a,b) for(ll i=a;i<b;i++)
#define REPI(i,a,b) for(ll i=b-1;i>=a;i--)
#define ff first
#define ss second
#define pb push_back
#define db pop_back
#define mp make_pair
#define mt make_tuple
#define g(a,b) get<a>(b)
#define INF (ll)1e18+5
#define ull unsigned long long
 
#define o_set tree<int, null_type,less<int>, rb_tree_tag,tree_order_statistics_node_update>
#define o_setll tree<ll, null_type,less<ll>, rb_tree_tag,tree_order_statistics_node_update>
//member functions :
//1. order_of_key(k) : number of elements strictly lesser than k
//2. find_by_order(k) : k-th element in the set
 
ll modI(ll a, ll m);
ll gcd(ll a, ll b);
ll powM(ll x, unsigned ll y, unsigned ll m);
void pairsort(int a[], int b[], int n);
void pairsortll(ll a[],ll b[],ll n);
ll logint(ll x,ll y);
 
 
ll gcd(ll x,ll y)
{
    if(x==0) return y;
    return gcd(y%x,x);
}
 
ll powM(ll x,ll y,ll m)
{
    if(y==0) return 1;
    ll p=powM(x,y/2,m)%m;
    p=(p*p)%m;
    return (y%2==0)?p:(x*p)%m;
}
 
ll modI(ll a, ll m)
{
   return powM(a, m-2, m);
}
 
void pairsort(int a[],int b[],int n)
{
    pair<int,int> v[n];
    REP(i,0,n)
    {
        v[i].ff=a[i];
        v[i].ss=b[i];
    }
    sort(v,v+n);
    REP(i,0,n)
    {
        a[i]=v[i].ff;
        b[i]=v[i].ss;
    }
}
 
void pairsortll(ll a[],ll b[],ll n)
{
    pair<ll,ll> v[n];
    REP(i,0,n)
    {
        v[i].ff=a[i];
        v[i].ss=b[i];
    }
    sort(v,v+n);
    REP(i,0,n)
    {
        a[i]=v[i].ff;
        b[i]=v[i].ss;
    }
}
 
ll logint(ll x,ll y)
{
    ll ans=0;
    ll a=1;
    for(ll i=0;i<=x;i++)
    {
        if(x<a)
        {
            return ans;
        }
        ans++;
        a*=y;
    }
    return -1;
}
const int N = 2e5+5;
/*ll parent[N];
ll siz[N];
vector<pair<ll, pair<ll, ll> > > v;
void make(){
    REP(i, 0, N){
        parent[i]=i;
        siz[i] = 1;
    }
}
ll find(ll x){
    while(parent[x] != x){
        x = parent[x];
    }
    return x;
}
void unite(ll a, ll b){
    a = find(a);
    b = find(b);
    if(a != b){
        if(siz[a] < siz[b]){
            swap(a, b);}
        parent[b] = a;
        if(siz[a] == siz[b]){
            siz[a]++;
        }
    }
} */
/*pair<ll, string> hashtable[100005];
int hashfunc(ll x){
    return x%100001;
}
string search(ll x){
    int j = hashfunc(x);
    while(hashtable[j].ff != x && hashtable[j].ss != ""){
        j = (j+1)%100001;
    }
    return hashtable[j].ss;
}

void insert(ll x, string s){
    int j = hashfunc(x);
    while(hashtable[j].ss != ""){
        j = (j+1)%100001;
    }
    hashtable[j].ff = x;
    hashtable[j].ss = s;
}*/


int main()
{
    ios::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    //freopen("input.txt", "r", stdin);
    //freopen("output.txt", "w", stdout);
    string s;
    cin>>s;
    int ar[(int)s.size()+1];
    memset(ar, -1, sizeof(ar));
    stack<int>st;
    if(s[0] == '<'){ar[0] = 0;
    st.push(0);}
    REP(i, 1, (int)s.size()){
        if(s[i-1] == '>' && s[i] == '<'){
            ar[i] = 0;
            st.push(i);
        }
    }
    if(s[(int)s.size()-1] == '>'){
        ar[(int)s.size()] = 0;
        st.push((int)s.size());
    }

    while(!st.empty()){
        int j = st.top();
        st.pop();
        REP(i, j, (int)s.size()){
            if(s[i] == '>'){break;}
            ar[i+1] = max(ar[i+1], ar[i]+1);
        }
        for(int i=j-1; i>=0; i--){
            if(s[i] == '<'){break;}
            ar[i] = max(ar[i], ar[i+1]+1);
        }
    }
    ll ans=0;
    REP(i, 0, (int)s.size()+1){
        ans += (ll)ar[i];
    }
    cout<<ans;


}

Measured memory_bytes: 3228