19 lines
322 B
C
19 lines
322 B
C
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#include <stdio.h>
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int main(void){
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int list[32] = {0}, n, idx = 0;
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while(scanf("%d",&n) == 1 && ~n){
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if(n) list[idx++] = n;
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else{
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int count = 0;
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for(int i = 0; i < idx; i++){
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for(int j = 0; j < idx; j++)
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if(list[j] == 2*list[i]) count++;
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}
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printf("%d\n",count);
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idx = 0;
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}
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}
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return 0;
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}
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