#include<stdio.h>
#include<math.h>
int main()
{
int n,x,fac,sum=1;
scanf("%d",&x);
scanf("%d",&n);
for(int i=1;i<=n;i++)
{
fac=1;
for(int j=1;j<=i;j++)
{
fac=fac*j;
}
sum=sum+(pow(-1,i)*pow(x,i))/fac;
}
printf("%d",sum);
return 0;
}
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