error C2064: term does not evaluate to a function taking 1 arguments

I am having problem with this coding any help would be appreciated. I have to use the struct command.

#include <iostream>

using namespace std;

int main ()

{
    struct Time_computed  //this describes the structure name
    {
        int total;
        int minutes;
        int hours;
        int seconds;
    }ss, mm, hh,tt;                    //these are VARIABLES in the stuct can be used to combine float and int type by the variable.name

    cout << "Please enter Minutes";
cin >> mm.minutes;
cout << "Please enter Hours";
cin >> hh.hours;
cout << "Please enter Seconds";
cin >> ss.seconds;

tt.total= ((ss.seconds) + ((mm.minutes)(1/60)) + ((hh.hours)(1/3600))); [B} Problem occurs here[/B]
    cout << "This is the total time in seconds: " << tt.total <<endl;
    return 0;
}