7th_B
#include<cstdio>double mul(double x,int y){double result=1.0;for(int i=0;i<y;i++){result*=x;}return result;}int main(){int n=0;double A=0,B=0;double a;double res_A;double res_B;scanf("%d%lf%lf",&n,&A,&B);for(int i=0;i<n+1;i++){scanf("%lf",&(a));double temp=a/(i+1);res_A+=temp*mul(A,i+1);res_B+=temp*mul(B,i+1);}int result = (int)(res_B-res_A+0.5);printf("%d\n",result);return 0;}
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