function main(N, S) {
  if (N%2 == 0) {
    
    var a = S.slice(0, N/2)
  	var b = S.slice(N/2, N)
    
    if (a === b) {
      console.log('Yes')
      return
  	}
    
  } else {
    console.log('No')
  }
}

main(require('fs').readFileSync('/dev/stdin', 'utf8'));