#include <stdio.h>

        int main() {

        int x;
        int sum = 0;;

                for(x = 1; x < 1000; x++) {
                        if(x % 3 == 0 || x % 5 == 0) {
                                sum += x;
                        }
                }

                printf("%d\n", sum);

                return 0;
        }