/*
Author: Nguyen Nhut Truong
From Chuyen Tien Giang High School For The Gifted
*/
#include <bits/stdc++.h>
using namespace std;
//#define int long long
#define start signed main
#define fi first
#define se second
#define pb push_back
#define eb emplace_back
#define il pair<int,ll>
#define ii pair<int,int>
#define len(s) (int)s.size()
#define all(s) (s).begin(),(s).end()
#define OpenFile(Name) if (fopen(Name".inp","r")) freopen(Name".inp","r",stdin),freopen(Name".out","w",stdout);
#define MASK(x) ((1LL)<<(x))
#define Bit(x,i) (((x)>>(i))&1)
#define Countbit(x) __builtin_popcountll(x)
typedef long long ll;
typedef long double ld;
int dx[]={1,-1,0,0,-1,1,1,-1};
int dy[]={0,0,1,-1,-1,-1,1,1};
template <class C> bool Minimize(C &a, C b) { if (a>b) { a=b; return true; } return false;}
template <class C> bool Maximize(C &a, C b) { if (a<b) { a=b; return true; } return false;}
inline ll add(ll a,ll b,ll c) { return (a+b)%c; };
inline ll suf(ll a,ll b,ll c) { return (a-b+c)%c; };
inline ll mul(ll a,ll b,ll c) { return ((a%c)*(b%c))%c; };
mt19937_64 rd(chrono::steady_clock::now().time_since_epoch().count());
ll rand(ll l,ll r){
assert(l<=r);
return l+rd()%(r-l+1);
}
void MakeInp() {
ofstream cout("Task.inp");
cout.close();
}
/// Constant Limit
const int N=1e6+5,M=1e3+5,INF=1e9,lim=1e6;
const int block=448,base=31;
ll Mod=1e9+7,Mod_base=1777777777,LNF=1e18;
///________________________________________________________________________________________________________
stack<int> a;
start() {
ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0);
OpenFile("TASK");
string s; getline(cin,s);
ll k=0,cur=0;
for (int i=0;i<len(s);++i) {
if (s[i]=='H') a.push(1); else
if (s[i]=='C') a.push(12); else
if (s[i]=='O') a.push(16); else
if (s[i]=='(') a.push(-1); else
if (s[i]>='0' && s[i]<='9') {
k=a.top();
a.pop();
a.push(k*(s[i]-'0'));
}
if (s[i]==')') {
cur=0;
while (!a.empty() && a.top()!=-1) {
cur+=a.top();
a.pop();
}
a.pop();
a.push(cur);
}
}
ll ans=0;
while (!a.empty()) {
ans+=a.top();
a.pop();
}
cout<<ans;
//cerr<<"\nBien dich thanh cong\nTime: "<<(1.0*clock()/CLOCKS_PER_SEC)<<" s\n";
return 0;
}
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