题目
分析
无
代码
#include<cmath>
#include<cstdio>
#include<cstring>
#include<algorithm>
using namespace std;
int read(){
int x=0,f=1;char c=getchar();
while(c<'0'||c>'9'){if(c=='-')f=-1;c=getchar();}
while(c>='0'&&c<='9')x=(x<<3)+(x<<1)+(c^48),c=getchar();
return x*f;
}
int main(){
freopen("tarifa.in" ,"r", stdin);
freopen("tarifa.out","w",stdout);
int X=read(),N=read();
int Ans=X;
for(int i=1;i<=N;i++)
Ans+=X-read();
printf("%d",Ans);
}