projecteuler Smallest multiple

2520 is the smallest number that can be divided by each of the numbers from 1 to 10 without any remainder.

What is the smallest positive number that is evenly divisible by all of the numbers from 1 to 20?

 

译：

2520是能被从1到10整除的最小整数，求出能被从1到20整除的最小数。

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第一次code:

public class Main
{  
     public static void main (String[] args) 
     {     
        System.out.println(sum(600000000)); 
     }   
     public static int sum(int num)
     {
      int c=0;
      for(int i=1;i<num;i++)
      {
          if(i % 1== 0 && i % 2 ==0
          && i % 3== 0 && i % 4 ==0
          && i % 5== 0 && i % 6 ==0
          && i % 7== 0 && i % 8 ==0
          && i % 9== 0 && i % 10 ==0
          && i % 11== 0 && i % 12 ==0
          && i % 13== 0 && i % 14 ==0
          && i % 15== 0 && i % 16 ==0
          && i % 17== 0 && i % 18 ==0
          && i % 19== 0 && i % 20 ==0
                  )
          {
              c=i;
              break;
          }
          else
          {
              c=111;
          }
       }
       return c;
     }
}