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Cod sursa(job #80334)
#include<stdio.h>
#include<math.h>
long long n, b, f, nr, ex, min, fminim;
int prim(long long x)
{
if (x==1 || x==0) return 0;
if (x==2) return 1;
for (long long i=3; i*i<=x; i+=2)
if (x%i==0) return 0;
return 1;
}
void descomp(long long x)
{
long long y=x; min=1000;
if (y%2==0)
{
f=2;ex=0;
while (y%2==0) { y/=2; ex++;}
min=ex;
fminim=2;
}
for (long long i=3; i<=y; i+=2)
{
if (y%i==0)
if (prim(i))
{
ex=0;
f=i;
while (y%i==0) { y/=i; ex++;}
fminim=f; min=ex;
}
}
}
long long nrz(long long x)
{
long long p=1, contor=0;
while (pow(fminim,p)<=x) contor+=(x/pow(fminim,p++));
return contor;
}
int main()
{
long long i,z,k,p;
freopen("zero2.in","r",stdin);
freopen("zero2.out","w",stdout);
long long nr, contor=0;
for (z=1; z<=10; z++)
{
scanf("%lld %lld",&n, &b);
descomp(b);
contor=0;
k=floor(n/fminim)-1;
for (p=1; p<=min; p++) contor+=(k*(k+1)/2*pow(fminim,p) + (k+1)*(n-(k+1)*pow(fminim,p)+1));
// for (i=1; i<=n; i++) contor+=nrz(i);
printf("%lld\n",contor);
}
return 0;
}