#include<bits/stdc++.h>
using namespace std;

//#define int long long

typedef pair<int,int>pint;
typedef vector<int>vint;
typedef vector<pint>vpint;
#define endl '\n'
#define pb push_back
#define mp make_pair
#define fi first
#define se second
#define all(v) (v).begin(),(v).end()
#define rep(i,n) for(int i=0;i<(n);i++)
#define reps(i,f,n) for(int i=(f);i<(n);i++)
#define each(it,v) for(__typeof((v).begin()) it=(v).begin();it!=(v).end();it++)
template<class T,class U>void chmin(T &t,U f){if(t>f)t=f;}
template<class T,class U>void chmax(T &t,U f){if(t<f)t=f;}

typedef string::const_iterator state;

int get(state &b){
    int ret=0;
    while(isdigit(*b)){
        ret=ret*10+*b-'0';
        b++;
    }
    return ret;
}

int main(){
    string s;cin>>s;s+="=";
    state b=s.begin();
    int a=get(b);
    while(true){
        if(*b=='*'){
            b++;
            int x=get(b);
            a+=x;
        }
        else if(*b=='+'){
            b++;
            int x=get(b);
            a*=x;
        }
        else break;
    }
    cout<<a<<endl;
    return 0;
}