Min  999x11+  10x12+  3x13+  6x14+  9x15+
       5x21+ 999x22+  5x23+  4x24+  2x25+
       4x31+   9x32+999x33+  7x34+  8x35+
       7x41+   1x42+  3x43+999x44+  4x45+
       3x51+   2x52+  6x53+  5x54+999x55
st
     x11+  x12+  x13+  x14+  x15=1
     x21+  x22+  x23+  x24+  x25=1
     x31+  x32+  x33+  x34+  x35=1
     x41+  x42+  x43+  x44+  x45=1
     x51+  x52+  x53+  x54+  x55=1
     x11+  x21+  x31+  x41+  x51=1
     x12+  x22+  x32+  x42+  x52=1
     x13+  x23+  x33+  x43+  x53=1
     x14+  x24+  x34+  x44+  x54=1
     x15+  x25+  x35+  x45+  x55=1
       x31=0
       
END
INTE¡@25