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- #include <iostream>
- #define ll long long
- using namespace std;
- int n,m,k,l,r;
- inline ll get(int val){
- ll res=0;
- for(int i=1;i<=m;i++){
- res+=min(n,val/i);
- }
- return res;
- }
- int main()
- {
- cin>>n>>m>>k;
- if(n<m)
- swap(n,m);
- l=1,r=m*n;
- while(l<=r){
- int mid=(l+r)/2;
- if(get(mid)>=k)
- r=mid-1;
- else
- l=mid+1;
- }
- cout<<l;
- return 0;
- }
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