function main(input) {
  input = input.trim();
  const a = input.split(' ');
  
  if(a[1]=='+'){
    console.log(a[0]+a[2])
  }else if(a[1]=='-'){
    console.log(a[0]-a[2])
  }
}
main(require('fs').readFileSync('/dev/stdin', 'utf8'));