pe1.apex

// If we list all the natural numbers below 10 that are multiples of 3 or 5, we get 3, 5, 6 and 9. The sum of these multiples is 23.
// Find the sum of all the multiples of 3 or 5 below 1000.

void doShit() {
    Integer currentValue = 1;
    Integer acc = 0;
    
    while(currentValue < 1000) {
        boolean imot = ((currentValue / 3) == (currentValue / 3.0));
        boolean imof = ((currentValue / 5) == (currentValue / 5.0));
        
        if(imot || imof){
            acc += currentValue;
        }
        
        currentValue += 1;
    }
    
    System.debug(acc);    
}

doShit();