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int main()
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{
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double x,k=1,f=1,e,n;
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double a=0;
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scanf("%lf %lf",&x,&n);
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if(n < 0)
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printf("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 =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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printf("%.6lf",f);
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}
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return 0;
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}
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