#include <iostream>
using namespace std;
 
int main() {
	// your code goes here
	int arr[5]={35,40,60,80,50};
	int start=80,end=265;
	cout<<"Enter the number of students/n";
	int k,ans;
	cin>>k;
	while(start<=end){
		int mid= start+(end-start)/2;
 
		if(k>5){
			cout<<"yai nhi ho skta :"<<-1;
			return 0;
		}
		int pages=0,count=1;
		for(int i=0;i<5;i++){
			pages+=arr[i];
			if(pages> mid){
				count++;
				pages=arr[0];
			}
		}
 
		if(count==k){
			ans=mid;
			end=mid-1;
		}else{
			start=mid+1;
		}
	}
	cout<<ans;
	return 0;
}

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3