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27 lines
446 B
27 lines
446 B
4 years ago
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import java.util.Scanner;
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public class duishu {
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public static void main(String args[]) {
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double x,k=1,f=1,e,n,a=0;
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Scanner sc = new Scanner(System.in);
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x=sc.nextDouble();
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n=sc.nextDouble();
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if(n < 0)
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System.out.println("error");
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else
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{
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for(int i = 1;i <= n;i++)
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{
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a =Math.pow((double)x,(double)i);
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k = k*i;
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e = a/k;
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f += e;
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}
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System.out.println((double)f);
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}
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}
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}
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