The code of the 14 variant. On Visual Basic you can write yourself.

#include <iostream.h>
#include <math.h>

//function to find the maximum value
double min(double x, double y)
{
    if ( x < y ) {
        return x;
    } else {
        return y;
    }
}

//function to find the minimum value
double max(double x, double y)
{
    if ( x > y ) {
        return x;
    } else {
        return y;
    }
}


int main()
{
    double a, b, c, amount, intermediate;
    
    cout << "Input the a, b, c: " << endl;
    cin >> a >> b >> c;
    
    intermediate = a + b + c;
        
        //the first condition
        if ( intermediate >= 0 )
        {
            amount = 0.5 * max( a, max( b, c ) ) + a;
        }
        
        //the second condition
        if (( intermediate < 0 ) && ( a >= 0 ))
        {
            amount = 2.1 * ( 1 - a * a ) + cos( b / ( c + 1 ) );
        }
        
        //the third condition
        if (( intermediate < 0 ) && ( a < 0 ))
        {
            amount = a * a + min( b, c );
        }
    
    cin.get();
    cout << "Final answer: " << amount << endl;
}