2^1 = 2 1516:4=379
2^2= 4 U(2^1516) =2
2^3= 8
2^4 = 16
2^5 = 32
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8^1=8 301:4=75 r1
8^2=64 U(8^301)=8
8^3=512
8^4=4096
8^5=32768
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7^1=7 202:4=50 r2
7^2=49 U(7^202)=9
7^3=343
7^4=2401
7^5=16807
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2^1516 + 8^301 + 7^202 = 2+8+9 = 19 => 9