function m(line){
var arr = line.split(" ");
arr.sort(function (x,y){
return x-y;
});
var sum =arr[2];
let count = 0;
while(count < 3){
for(let i=0;i<arr.length;i++){
if(arr[i]<sum && arr[i]%sum = = = 0){
count++;
}
}
if(count<3){
sum++;
count=0;
}
}
console.log(sum);
}
r("1 2 3 4 5");
var arr = readline().split(" ").sort(function(a,b){return a-b;});
var sum = arr[2];
let count=0;
while(count<3){
for(i=0;i<arr.length;i++){
if(arr[i]<= sum && sum%arr[i]===0) {
count++;
}
}
if(count<3){
sum++;
count=0;
}
}
print(sum)