#include <bits/stdc++.h>

#define ll long long
#define ld long double
#define rep(i,a,b) for (int i = a; i < b; i++)
#define irep(i,a,b) for (int i = a; i > b; i--)
#define print(n) cout << n << endl
#define rup(a,b) (a+b-1)/b

using namespace std;

int main(){
    cout << fixed << setprecision(15);
    
    string s;
    cin >> s;
    int now = 0;
    int count = 0;
    int last = -1;
    rep(i,0,s.size()){
        char n = s[i];
        if (n=='*'){
        }else if(n=='+'){
        }else{
            count *= 10;
            count += int(n-'0');
            continue;
        }
        if (last==0){
            now += count;
            count = 0;
        }else if (last==1){
            now *= count;
            count = 0;
        }else{
            now = count;
            count = 0;
        }
        last = int(n=='+');

    }
            if (last==0){
            now += count;
            count = 0;
        }else if (last==1){
            now *= count;
            count = 0;
        }
    print(now);
    //system("pause");
    return 0;
}