#include<iostream> int main(){ int qx; float bj,sr; scanf("%d %f",&qx,&bj); if(qx==1){ sr=bj+bj*0.0225; } if(qx==2){ sr=bj+(bj*0.0243)+((bj+bj*0.0243)*0.0243); } if(qx==3){ sr=bj+(bj*0.0270)+((bj+bj*0.0270)*0.0270)+(((bj+bj*0.0270)*0.0270+bj)*0.0270); } if(qx==4){ sr=bj+(bj*0.0288)+((bj+bj*0.0288)*0.0288)+(((bj+bj*0.0288)*0.0288+bj)*0.0288)+((((bj+bj*0.0288)*0.0288+bj)*0.0288+bj)*0.0288); } if(qx==5){ sr=bj+(bj*0.0300)+((bj+bj*0.0300)*0.0300)+(((bj+bj*0.0300)*0.0300+bj)*0.0300)+((((bj+bj*0.0300)*0.0300+bj)*0.0300+bj)*0.0300)+(((((bj+bj*0.0300)*0.0300+bj)*0.0300+bj)*0.0300+bj)*0.0300); } printf("合计为%f",sr); return 0; }