=1+49+2+48+3+47+4+46+5+45+6+44+7+43+8+42+9+41+10+40+11+39+12+38+13+37+14+36+15+35+16+34+17+33+18+32+19+31+20+30+21+29+22+28+23+27+24+26+25+50
=50+50+50+50+50.+50+25
=25*50+25
=1275
=1+49+2+48+3+47+4+46+5+45+6+44+7+43+8+42+9+41+10+40+11+39+12+38+13+37+14+36+15+35+16+34+17+33+18+32+19+31+20+30+21+29+22+28+23+27+24+26+25+50
=50+50+50+50+50.+50+25
=25*50+25
=1275