# include <stdio.h>
# include <math.h>
float mypow(float x,float n)
{
return pow(x,n);
}
float fact(float m)
{
if(m==0||m==1)
{
return 1;
}
else
{
return m*fact(m-1);
}
}
main()
{
float x,n,i,sum=0;
scanf("%f%f",&x,&n);
for(i=1;i<=n;i++)
{
sum=sum+mypow(-1,i-1)*mypow(x,i)/fact(i);
}
printf("%.4f",sum);
}
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