process.stdin.resume();
process.stdin.setEncoding('utf8');
// Your code here!

main(require('fs').readFileSync('/dev/stdin', 'utf8').trim().split("\n"));
function main(inputs){
    var N = inputs[0].split(" ")[0]-0;
    var X = inputs[0].split(" ")[1]-0;
    var list = inputs[1].split(" ").map(v=>v-0);
    var map = {};
    list.forEach(v=>{
        map[v] = (map[v]||0)+1;
    });
    
    var ans = 0;
    list.forEach(v=>{
        ans += map[X-v]||0;
    });
    
    console.log(ans);
}