C :

#include<stdio.h>

int main(){
  int a,b,i,sum;
  scanf("%d %d",&a,&b);
  i=a;
  sum=0;
  while(i<=b){
    if(i%3==1&&i%5==3){
       sum+=i;
    } 
    ++i;
  }
  printf("%d\n",sum);
  return 0;
}