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#include <cstdio>
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using namespace std;
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int main()
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{
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int T,n,a,b;
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scanf("%d",&T);
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while(T--)
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{
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long long sum=0;
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scanf("%d",&n);
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while(n--)
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scanf("%d%d",&a,&b),sum+=a*b;
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printf("%lld\n",sum);
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}
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return 0;
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}
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