#include <string>
#include <iostream>
#include <list>
#include <algorithm>
using namespace std;
int main(){
    int n,i,j,k,rb,kp,s=0;
    cin>>rb>>kp;
    while(rb>=5){rb-=5;s++;}
    while(rb>=2){rb-=2;s++;}
    while(rb>=1){rb-=1;s++;}
    while(kp>=50){kp-=50;s++;}
    while(kp>=10){kp-=10;s++;}
    while(kp>=5){kp-=5;s++;}
    while(kp>=1){kp-=1;s++;}
    cout<<s;
return 0;}