let result: number[] = [];

for (let i of grades) {
   if (i < 38) {
      result.push(i);
   } else {
      if ((i + 2) % 5 == 0) {
            result.push(i + 2);
      } else if ((i + 1) % 5 == 0) {
            result.push(i + 1);
      } else {
            result.push(i);
      }
   }
}

return result;