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- #include<stdio.h>
- int main()
- {
- int n;
- scanf("%d",&n);
- n=n*(n+1)/2;
- int q;
- scanf("%d",&q);
- while(q--)
- {
- int x;
- scanf("%d",&x);
- n-=x;
- }
- printf("%d\n",n);
- return 0;
- }
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