Program

#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
 
using namespace std;
 
int main()
{
    ios_base::sync_with_stdio(0),cin.tie(0),cout.tie(0);
 
    int x,y,c;
    cin >> x;
    c = 0;
 
    while (x>=5) x-=5,c++;
 
    if (x!=0) c++;
    
    cout << c << '\n';
    return 0;
}

x=int(input())
steps=0
while(x>=5):x-=5;steps+=1
if x != 0:steps+=1
print(steps)

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