为什么不是't我的javascript向Project Euler返回正确答案's排名第一

我正在尝试使用Javascript解决Project Euls问题一。我知道这不是最有说服力的解决方案，但我不明白为什么它不起作用。我把三、五的倍数取到1000以下，然后把它们存储在两个单独的数组中。然后，我将数组添加在一起，使用console.log（）输出答案，得到的答案是266333，而不是正确的答案233168。有人知道为什么吗？

/* Declaring Global Variables */
var n; 
var sumOfThree = 0;
var sumOfFive = 0;
/* Declaring Arrays */
multiplesOfThree = [];
multiplesOfFive = [];
/* Finding how many numbers < 1000 divide evenly by three and five then adding them to my arrays*/
console.log("Let's calculate how many numbers divide evenly by three and five in the number one thousand.");
console.log("Calculating...");
for(n = 0; n < 1000; n ++) {
    if(n % 3 === 0) { 
    multiplesOfThree.push(n);
    }
}
for(n = 0; n < 1000; n ++) {
    if(n % 5 === 0) { 
        multiplesOfFive.push(n);
    }
}
/* Letting the User know how many multiples of three exist */
console.log()
console.log("There are " + multiplesOfThree.length + " multiples of three in the number one thousand.");
/* Letting the user know how many multiples of five exist */
console.log()
console.log("There are " + multiplesOfFive.length + " multiples of five in the number one thousand.");
console.log()
/*Letting the User know the sum of the number of multiples*/
console.log("Let's get the sum of the number of multiples.");
console.log("Calculating...");
console.log(multiplesOfThree.length + multiplesOfFive.length);
console.log()
/* Letting the user know the sum of all the three multiples*/
console.log("Let's get the sum of all the three multiples")
console.log("Calculating... ");
for (i=0; i < multiplesOfThree.length; i++) {
    sumOfThree += multiplesOfThree[i];
}
console.log(sumOfThree);
console.log()
/* Letting the User know the sum of all the five multiples */
console.log("Let's get the sum of five multiples")
console.log("Calculating... ");
for (i=0; i < multiplesOfFive.length; i++) {
    sumOfFive += multiplesOfFive[i];
}
console.log(sumOfFive);
console.log()
/* Letting the user know the added sum of all the three, five multiples */
console.log("Let's add these two sums together")
console.log("Calculating... ");
var sumOfBoth = sumOfFive + sumOfThree;
console.log(sumOfBoth);