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Cod sursa(job #583135)
#include<fstream>
using namespace std;
ifstream f("fact.in");
ofstream g("fact.out");
int main()
{const long MAX_N=100;
long long p,i,exista[MAX_N],j,nr;
f>>p;
if(p>=1&&p<=4) {nr=p*5; g<<nr;}
else if(p>=6&&p<=10) {nr=p*5-5; g<<nr;}
else if(p>=12&&p<=16) {nr=p*5-10; g<<nr;}
else if(p>=18&&p<=22) {nr=p*5-15; g<<nr;}
else if(p>=24&&p<=28) {nr=p*5-20; g<<nr;}
else if(p==0) g<<1;
else
for(i=1;i<=MAX_N;i++)
exista[i]=1;
for(j=5;j<=MAX_N;j+=6)
{exista[j]=-1; if(p==j) g<<exista[j];}
}