let matrixSize = gets();
matrixSize = matrixSize.split(" ");
matrixSize = matrixSize.map(Number);
//console.log(matrixSize);
const n = matrixSize[0];
const m = matrixSize[1];
let myMatrix = [];
for (let i = 0; i < n; i += 1) {
  let row = gets();
  row = row.split(" ");
  //row = row.map(String);
  //console.log(row);
  myMatrix.push(row);
}

//console.log(myMatrix);
let LastArray = [];
//LastArray = [].concat(...myMatrix);
LastArray = myMatrix;
let sequence = 0;
let longestSequence = 0;

for (let i = 0; i < n; i++) {
  for (let k = 0; k < m; k++) {
    if (sequence > longestSequence) {
      longestSequence = sequence;
    }
    sequence = 0;
    for (let j = 0; j < LastArray.length; j++) {
      for (let h = 0; h < LastArray.length; h++) {
        if (myMatrix[i][k] === LastArray[j][h]) {
          sequence += 1;
        }
      }
    }
  }
}
print(longestSequence);