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- #include <stdio.h>
- #include <stdlib.h>
- long long numbers(long long n)
- {
- long long i;
- long long count=0;
- for(i=2;i<=sqrt(n);i++)
- {
- while(n%i==0)
- {
- n/=i;
- count++;
- }
- }
- if(n!=1)
- {
- count++;
- }
- return count;
- }
- long long fact(long long n)
- {
- if(n<=1)
- {
- return 0;
- }
- else
- {
- return numbers(n)+fact(n-1);
- }
- }
- int main()
- {
- long long n;
- while(scanf("%lld",&n)!=EOF)
- {
- printf("%lld\n",fact(n));
- }
- return 0;
- }
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