#include <iostream>

using namespace std;

int main ()
{
    int num1 = 1;            //initialize the first term
    int num2 = 2;            //initialize the second term
    int num3 = 0;            //initialize the container                
    int sum = 0;             //initialize the sum

    
    //iterate as long as the largest term is less than 4000000
    while (num2 <= 4000000)
    {
        //check for divisibility by 2
        if (num2%2 == 0)
        {
            sum = sum + num2;        //add even terms to sum
        }
        
        num3 = num2;                //store num2 in the container
        num2 = num1 + num2;         //add num1 and num2 for the next term in the sequence
        num1 = num3;                //move the number stored in the container to num1
    }

    cout << sum;            //output the sum

}

#include <iostream>

using namespace std;

int main()
{
    //initialize a variable to store the sum
    int sum = 0;

    //check each integer between 1 and 1000 for divisibility by 3 or 5 and add them to the sum
    for (int i = 0; i < 1000; i++)
    {
        if (i%3 == 0 || i%5 == 0)
        {
            sum = sum + i;
        }
    }

    //output the sum
    cout << sum;

}