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Cod sursa(job #805940)
#include <fstream>
using namespace std;
ifstream f("fact.in");
ofstream g("fact.out");
int main(){
int n,p,sum;
f>>p;
sum=5*p;
if(sum<5)
g<<"1";
if(p>5)
sum=sum-p+5;
if(p>25)
sum=sum-p/5+5;
if(p>125)
sum=sum-p/25+5;
if(p>625)
sum=sum-p/125+5;
if(p>3125)
sum=sum-p/625+5;
if(p>15625)
sum=sum-p/3125+5;
if(p>78125)
sum=sum-p/15625+5;
if(p>390625)
sum=sum-p/78125+5;
if(p>1953125)
sum=sum-p/390625+5;
if(p>9765625)
sum=sum-p/1953125+5;
if(p>48828125)
sum=sum-p/9765625+5;
if(p>244140625)
sum=sum-p/48828125+5;
g<<sum;
}