int add(int x, int y)
{
int c;
while(y)
{
c = x & y;
x ^= y;
y = c << 1;
}
return(x);
}
int mult(int x, int y)
{
int p = 0, s = y;
if(y < 0) y = add(~y,1);
while(y)
{
if(y & 1) p = add(x, p);
x <<= 1;
y >>= 1;
}
if(s < 0) p = add(~p,1);
return(p);
}
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