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// coderbyte.com intro challenge

function jsChallenge() { 
 
  var num = 0;
  
  for(i=0; i<=1000; i++) {
    if( !(isMultipleOfFive(i) || isMultipleOfSeven(i)) ) {
       num += i;
     }
   }
    
  return num;
  
  function isMultipleOfFive(n) {
    return n % 5 === 0;
  }
  
  function isMultipleOfSeven(n) {
    return n % 7 === 0;
  }           
}

jsChallenge();