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- #include <bits/stdc++.h>;
- using namespace std;
- ifstream fi("");
- ofstream fo("");
- long long l,r;
- long long f[100001];
- int mainin()
- {
- cin>>l>>r;
- return 0;
- }
- int mainout()
- {
- long long i,tt,q,d;
- f[1]=1;f[2]=3;f[3]=4;
- for (i=4;i<r;i++)
- {
- tt=2;
- while ((tt<floorf(sqrt(i))) && (i % tt >0) ) tt++;
- if (i % tt ==0)
- {
- q=(int)i/tt;
- f[i]=f[q]+f[q]*tt;
- if (q % tt ==0) f[i]=f[i]-f[q/tt]*tt;
- } else f[i]=i+1;
- }
- d=0;
- for (i=l;i<=r;i++)
- if (f[i]>2*i) d++;
- cout<<d;
- return 0;
- }
- int main()
- {
- mainin();
- mainout();
- return 0;
- }
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