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https://github.com/Kiritow/OJ-Problems-Source.git
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21 lines
400 B
C++
21 lines
400 B
C++
#include <cstdio>
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using namespace std;
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typedef long long LL;
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int main()
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{
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LL n,k;
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while(~scanf("%I64d%I64d",&n,&k)){
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LL ans=n*k;
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if(n>k) n=k;
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for(LL i=1;i<=n;){
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LL d=k/i;
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LL j=k/d;
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if(j>n) j=n;
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ans-=d*(i+j)*(j-i+1)/2;
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i=j+1;
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}
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printf("%I64d\n",ans);
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}
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return 0;
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}
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