#include<iostream>
#include<stdio.h>#include <stdlib.h>
#include<string.h>
int main(){
int x, y;
scanf("%d%d", &x, &y);
int count = 0;
for(int i = x; i <= y; ++i){
char num[6] = {0};
sprintf(num,"%d",i);
int sum = 0;
for(int j = 0; j < strlen(num); ++j){
sum += num[j]-48;
}
if(sum % 5 == 0)
count++;
}
printf("%d\n", count);
return 0;
}
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