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- #include <bits/stdc++.h>
- using namespace std;
- int main()
- {
- ios_base::sync_with_stdio(0);
- cin.tie(0);cout.tie(0);
- long long int a,c,d=0,e,f,i,j,k,l;
- cin>>a>>c;
- for(i=1;i<=a;i++)
- {
- d+=(c+i%5)/5;
- }
- cout<<d<<endl;
- return 0;
- }
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