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Cod sursa(job #783459)
#include <fstream>
using namespace std;
ifstream f("ciur.in");
ofstream g("ciur.out");
int n,x,v[2000000],i,t,y=1,p,r;
void ciur(int t,int p)
{for(i=t;i<=p;i++)
{if(v[i]%x!=0)
{v[r]=v[i];
r++;}
}
}
int main()
{f>>n;
for(i=1;i<=n-1;i++)
v[i]=i+1;
x=2;
t=2;
p=n-1;
while(t<p)
{r=t;
ciur(t,p);
p=r-1;
t++;
x=v[t-1];
}
g<<t;
return 0;
}