c語言編程:猴子第壹天摘下若幹個桃子，當即吃了壹半，還不過癮，又多

int main(void)

{

int a,y;

long long int x=1;

scanf("%d",&a);

for(y=a;y>1;y--)

{

x=(x+y-1)*2;

}

printf("The monkey got %ld peachs in first day.\n",x);

}