#define _DEBUG 0
#if _DEBUG
#endif

#include<stdio.h>
#include<stdbool.h>
#include<string.h>
#include<stdlib.h>
int main(void)
{
  int scan;//scanf警告用
  int i, j;
  
  int n,x;scan=scanf("%d%d",&n,&x);
  int a[111];
  int sum=0;
  for(i=0; i<n; i++)
  {
    scan=scanf("%d",&a[i]);
    sum+=a[i];
  }
  printf("%d", 0>sum-x ? 0:sum-x);
  return scan-scan;
}