#include <stdio.h>
#include <string.h>
#include <algorithm>
using namespace std;
#define N 1010
int a[N];
int main(){
memset(a, 0, sizeof(0));
int n;
scanf("%d", &n);
for(int i=0; i<n; ++i){
scanf("%d", &a[i]);
}
sort(a, a+n);
int count = 0;
for(int i=1; i<n; ++i){
if(a[i]-a[i-1] == 1){
count++;
}
}
printf("%d\n", count);
return 0;
}
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