Given base(B) and height(H) of a triangle find its area.

Given base(B) and height(H) of a triangle find its area.
Input Size : N <= 1000000
Sample Testcase :
INPUT
2 4
OUTPUT
4

const readline = require('readline');
 const inp = readline.createInterface({
  input: process.stdin
 });
 const userInput = [];
 inp.on("line", (data) => {
 userInput.push(data);
 });
 inp.on("close", () => {
 var data = userInput[0].split(" ");
 var a = parseInt(data[0]);
 var b= parseInt(data[1]);
console.log(0.5*a*b)
});

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