<코드업> 3120 : 리모컨

#include <iostream>
using namespace std;
int main() {
	int a, b,cnt=0;
	cin >> a >> b;
	a = abs(a - b);
			while (1) {
		if (a >= 10 || (a % 10 == 9) || (a % 10 == 8))
		{
			a -= 10;
			cnt++;
			a = abs(a);
		}
		else
			break;
	}
	while (1) {
		if (a >= 5 || (a % 5 == 4))
		{
			a -= 5;
			cnt++;
			a = abs(a);
		}
		else
			break;
	}
	cnt += a;
		cout << cnt;
}