#include <stdio.h>
int main(void)
{
int r,s,x,z,v,res=0;
for (r = 1; r < 10; r++)
for (z = 1; z < 10; z++)
for (s = 1; s < 10; s++)
for (x = 0; x < 10; x++)
for (v = 0; v < 10; v++)
res += (((1000*r + 100*s + 10*r + x) + (100*z + 10*v +v))
== (1000*s + 100*r + 10*x + s));
return 0;
}
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