#include <iostream> using namespace std; // 求每位之和 int PlaceSum(int i) { int sum = 0; while (i != 0) { sum += i % 10; i = i / 10; } return sum; } int main() { int x; int y; cin >> x >> y; int count = 0; for (int i = x; i <= y; i++) { int sum = PlaceSum(i); // 判断是否为5的倍数 if (sum % 5 == 0) { count++; } } cout << count; return 0; }