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// get all common multiples of 3 and 5 from 1~100, and return sum of them
function fn(num) {
   if (num > 100) {
       return 0;
   }
   if (num % 15 === 0) {
           return num + fn(num + 1);
   }
   return fn(num + 1);

}

console.log(fn(1));