#include <stdio.h>
int main(){
    int M,K;
    scanf("%d %d",&M,&K);
    if(M<=0 || K<=0){
        printf("Invalid Input");
        return 0;
    }
    float a[10][10],col[10];
    for(int i=0;i<M;i++){
        for(int j=0;j<k;j++){
            scanf("%f",&a[i][j]);
            if(a[i][j]<0){
                printf("Invalid Input");
                return 0;
            }
        }
        col[i] =a[i][0];
    }
    
    for (int i=0;i<M-1;i++){
        for (int j=i+1;j<M;j++){
            if (col[i] > col[j]){
                float temp =col[i];
                col[i] =col[j];
                col[j] =temp;
            }
        }
    }
    float median;
    if(M%2 == 0){
        median =(col[M/2-1] + col [M/2])/2;
    }
    else{
        median = col[M/2]; 
        printf("%2.f",median);
    }
    return 0;
}