Sum of the numbers upto N that are divisible by 2 or 5 | Java implementation of above approach ; Function to find the sum ; sum2 is sum of numbers divisible by 2 ; sum5 is sum of number divisible by 5 ; sum10 of numbers divisible by 2 and 5 ; Driver code
import java . lang . * ; import java . util . * ; class GFG { static long findSum ( int n ) { long sum2 , sum5 , sum10 ; sum2 = ( ( n / 2 ) * ( 4 + ( n / 2 - 1 ) * 2 ) ) / 2 ; sum5 = ( ( n / 5 ) * ( 10 + ( n / 5 - 1 ) * 5 ) ) / 2 ; sum10 = ( ( n / 10 ) * ( 20 + ( n / 10 - 1 ) * 10 ) ) / 2 ; return sum2 + sum5 - sum10 ; } public static void main ( String [ ] args ) { int n = 5 ; System . out . println ( findSum ( n ) ) ; } }