Get Prime Number and count it

prime-number.go

package main

import (
	"fmt"
)

func main() {
	var a, b, c int

	fmt.Scanf("%v", &a)

	for i := 1; i <= a; i++ {
		b = 0

		if c >= a {
			c = c - i
			break
		}

		for j := 1; j <= i; j++ {
			if (i % j) == 0 {
				b = b + 1
			}
		}

		if b <= 2 {
			c = c + i
		}

	}

	fmt.Println(c)
}