如何使用Scanf在Go中从控制台读取整数？

So I'm trying to do a codeforces problem (my first!) and I'm trying to read the input.

I initially tried using os.Args, but that caused a runtime error.

I am now trying this

package main

import (
    "fmt"
)

func main() {
    var n int
    var m int
    var a int
    fmt.Scanf("%d", &n)
    fmt.Scanf("%d", &m)
    fmt.Scanf("%d", &a)

    rectangleArea := n*m
    squareArea := a*a
    nSquares := 0
    for i := 0; i < rectangleArea + squareArea; i = i + squareArea {
        nSquares++
    }

    fmt.Println(nSquares)

}

But this seems to go into infinite loop when I run it with the arguments 6 6 4. Well, it goes into infinite loop with any argument.

What's going on?