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import (
	"fmt"
	"strconv"
)

func getResult(x , y int , operator string) int {
     switch operator {
            case "+" : return x + y
            case "-" : return x - y
            case "*" : return x * y
            case "/" : return x / y
     }
     return 0 
}

func evalRPN(tokens []string) int {
    answer := []int{}
    for _ , str := range tokens {

        if str == "+" || str == "-" || str == "*" || str == "/" {
            n := len(answer)
            x , y := answer[n-2] , answer[n-1]
            answer = answer[0:n-2]
            answer = append(answer , getResult(x , y , str))
        } else {
            if value , ok := strconv.Atoi(str) ; ok == nil {
                answer = append(answer , value)
            } 
        }
    }
    return answer[0]
}