calculator

#include <bits/stdc++.h>

#define ll long long
#define LIM 1000005
#define X first
#define Y second
#define EL cout<<"\n"

using namespace std;

float num[LIM];
char msign[LIM];

int main()
{
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    
    string s; cin >> s;

    int c1 = 0, c2 = 0, tmp = 0;

    for (int i = 0; i < (int)s.length(); i++)
    {
        if (s[i] == '+' || s[i] == '-' || s[i] == '*' || s[i] == '/')
        {
            msign[++c2] = s[i];
            num[++c1] = int(tmp);
            tmp = 0;
        }
        else
        {
            tmp = tmp * 10 + int(s[i] - '0');
        }
    }

    num[++c1] = tmp;
    tmp = 0;

    for (int i = 1; i <= c2; i++)
    {
        if (msign[i] == '*') 
        {
            num[i] = num[i] * num[i + 1];
            num[i + 1] = 1;
        }

        if (msign[i] == '/') 
        {
            num[i] = num[i] / num[i + 1];
            num[i + 1] = 1;
        }
    }

    float ans = num[1];

    for (int i = 1; i <= c2; i++)
    {
        if (msign[i] == '+') 
        {
            ans += num[i + 1];
        }

        if (msign[i] == '-') 
        {
            ans -= num[i + 1];
        }
    }

    cout << ans;





   

    return 0;
}