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package main
import (
"fmt"
"os"
"strconv"
"strings"
)
func main() {
file, _ := os.ReadFile("rounds.txt")
rounds, _ := strconv.Atoi(strings.TrimSpace(string(file)))
x := 1.0
pi := 1.0
stop := float64(rounds + 2)
for i := 2.0; i <= stop; i++ {
x = -x
pi += x / (2.0*i - 1.0)
}
pi *= 4.0
fmt.Println(pi)
}