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| #include <bits/stdc++.h>
#define int long long
#define N 1000005
#define mod 1000000007
using namespace std;
int n;
void solve(){
int f = 5,ans = 0;
for(int i=0;i<12;i++){
ans += n / f;
f *= 5;
}
cout<<ans<<"\n";
}
signed main(){
cin>>n;
solve();
return 0;
}
|