delete pics to save space

1.2261.cpp

@@ -0,0 +1,19 @@
+#include<cstdio>
+#include<algorithm>
+using namespace std;
+typedef long long LL;
+LL n,k,res;
+int main()
+{
+#ifdef local
+	freopen("pro.in","r",stdin);
+#endif
+	scanf("%lld%lld",&n,&k); res=n*k;
+	for(int l=1,r;l<=n;l=r+1)
+	{
+		r=k/l?min(k/(k/l),n):n;
+		res-=(k/l)*(l+r)*(r-l+1)/2;
+	}
+	printf("%lld\n",res);
+	return 0;
+}