import java.util.;
import java.io.;

public class Main{
public static void main(String[] args)throws Exception{
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
String[] numStr = br.readLine().split(” “);
int n = 0,m = 0;
long k = 0;
for(int i = 0;i < numStr.length;i++){
n = Integer.parseInt(numStr[0]);
m = Integer.parseInt(numStr[1]);
k = Long.parseLong(numStr[2]);
}
BinarySearch(k,m,n);
}

public static void BinarySearch(long target,int m,int n){
    long left = 1,right = (long)m*n;
    while(left <= right){
        long mid = left + (right - left) / 2;
        long num = getTarget(mid,m,n); 
        if(num >= target){
            right = mid - 1;
        }else{
            left = mid + 1;
        }
    }
    System.out.println(left);
}

public static long getTarget(long mid,int m,int n){
    long sum = 0;
    for(int i = 1;i <= n;i++){
        sum += Math.min(m,mid / i);
    }
    return sum;
}

}