For problem statement at 1000-1999/1200-1299/1230-1239/1236/problemB.txt this is a correct solution, but verifier at 1000-1999/1200-1299/1230-1239/1236/verifierB.go ends with All 100 tests passed can you fix the verifier? package main

import (
	"fmt"
)

func powMod(base, exp, mod int64) int64 {
	var res int64 = 1
	base %= mod
	for exp > 0 {
		if exp%2 == 1 {
			res = (res * base) % mod
		}
		base = (base * base) % mod
		exp /= 2
	}
	return res
}

func main() {
	var n, m int64
	if _, err := fmt.Scan(&n, &m); err != nil {
		return
	}
	const mod int64 = 1000000007
	waysForOneKind := (powMod(2, m, mod) - 1 + mod) % mod
	ans := powMod(waysForOneKind, n, mod)
	fmt.Println(ans)
}