#include <stdio.h>
int main(){//二分検索
	long long x,y[3761]={ 100,101,102,103,104,105,106,107,108,109,110,111,112,113,114,115,116,117,118,119,120,121,122,123,124,125,126,127,128,129,130,131,132,133,134,135,136,137,138,139,140,141,142,143,144,145,146,147,148,149,150,151,152,153,154,155,156,157,158,159,160,161,162,163,164,165,166,167,168,169,170,171,172,173,174,175,176,177,178,179,180,181,182,183,184,185,186,187,188,189,190,191,192,193,194,195,196,197,198,199,200,202,204,206,208,210,212,214,216,218,220,222,224,226,228,230,232,234,236,238,240,242,244,246,248,250,252,254,256,258,260,262,264,266,268,270,272,274,276,278,280,282,284,286,288,290,292,294,296,298,300,303,306,309,312,315,318,321,324,327,330,333,336,339,342,345,348,351,354,357,360,363,366,369,372,375,378,381,384,387,390,393,396,399,402,406,410,414,418,422,426,430,434,438,442,446,450,454,458,462,466,470,474,478,482,486,490,494,498,502,507,512,517,522,527,532,537,542,547,552,557,562,567,572,577,582,587,592,597,602,608,614,620,626,632,638,644,650,656,662,668,674,680,686,692,698,704,711,718,725,732,739,746,753,760,767,774,781,788,795,802,810,818,826,834,842,850,858,866,874,882,890,898,906,915,924,933,942,951,960,969,978,987,996,1005,1015,1025,1035,1045,1055,1065,1075,1085,1095,1105,1116,1127,1138,1149,1160,1171,1182,1193,1204,1216,1228,1240,1252,1264,1276,1288,1300,1313,1326,1339,1352,1365,1378,1391,1404,1418,1432,1446,1460,1474,1488,1502,1517,1532,1547,1562,1577,1592,1607,1623,1639,1655,1671,1687,1703,1720,1737,1754,1771,1788,1805,1823,1841,1859,1877,1895,1913,1932,1951,1970,1989,2008,2028,2048,2068,2088,2108,2129,2150,2171,2192,2213,2235,2257,2279,2301,2324,2347,2370,2393,2416,2440,2464,2488,2512,2537,2562,2587,2612,2638,2664,2690,2716,2743,2770,2797,2824,2852,2880,2908,2937,2966,2995,3024,3054,3084,3114,3145,3176,3207,3239,3271,3303,3336,3369,3402,3436,3470,3504,3539,3574,3609,3645,3681,3717,3754,3791,3828,3866,3904,3943,3982,4021,4061,4101,4142,4183,4224,4266,4308,4351,4394,4437,4481,4525,4570,4615,4661,4707,4754,4801,4849,4897,4945,4994,5043,5093,5143,5194,5245,5297,5349,5402,5456,5510,5565,5620,5676,5732,5789,5846,5904,5963,6022,6082,6142,6203,6265,6327,6390,6453,6517,6582,6647,6713,6780,6847,6915,6984,7053,7123,7194,7265,7337,7410,7484,7558,7633,7709,7786,7863,7941,8020,8100,8181,8262,8344,8427,8511,8596,8681,8767,8854,8942,9031,9121,9212,9304,9397,9490,9584,9679,9775,9872,9970,10069,10169,10270,10372,10475,10579,10684,10790,10897,11005,11115,11226,11338,11451,11565,11680,11796,11913,12032,12152,12273,12395,12518,12643,12769,12896,13024,13154,13285,13417,13551,13686,13822,13960,14099,14239,14381,14524,14669,14815,14963,15112,15263,15415,15569,15724,15881,16039,16199,16360,16523,16688,16854,17022,17192,17363,17536,17711,17888,18066,18246,18428,18612,18798,18985,19174,19365,19558,19753,19950,20149,20350,20553,20758,20965,21174,21385,21598,21813,22031,22251,22473,22697,22923,23152,23383,23616,23852,24090,24330,24573,24818,25066,25316,25569,25824,26082,26342,26605,26871,27139,27410,27684,27960,28239,28521,28806,29094,29384,29677,29973,30272,30574,30879,31187,31498,31812,32130,32451,32775,33102,33433,33767,34104,34445,34789,35136,35487,35841,36199,36560,36925,37294,37666,38042,38422,38806,39194,39585,39980,40379,40782,41189,41600,42016,42436,42860,43288,43720,44157,44598,45043,45493,45947,46406,46870,47338,47811,48289,48771,49258,49750,50247,50749,51256,51768,52285,52807,53335,53868,54406,54950,55499,56053,56613,57179,57750,58327,58910,59499,60093,60693,61299,61911,62530,63155,63786,64423,65067,65717,66374,67037,67707,68384,69067,69757,70454,71158,71869,72587,73312,74045,74785,75532,76287,77049,77819,78597,79382,80175,80976,81785,82602,83428,84262,85104,85955,86814,87682,88558,89443,90337,91240,92152,93073,94003,94943,95892,96850,97818,98796,99783,100780,101787,102804,103832,104870,105918,106977,108046,109126,110217,111319,112432,113556,114691,115837,116995,118164,119345,120538,121743,122960,124189,125430,126684,127950,129229,130521,131826,133144,134475,135819,137177,138548,139933,141332,142745,144172,145613,147069,148539,150024,151524,153039,154569,156114,157675,159251,160843,162451,164075,165715,167372,169045,170735,172442,174166,175907,177666,179442,181236,183048,184878,186726,188593,190478,192382,194305,196248,198210,200192,202193,204214,206256,208318,210401,212505,214630,216776,218943,221132,223343,225576,227831,230109,232410,234734,237081,239451,241845,244263,246705,249172,251663,254179,256720,259287,261879,264497,267141,269812,272510,275235,277987,280766,283573,286408,289272,292164,295085,298035,301015,304025,307065,310135,313236,316368,319531,322726,325953,329212,332504,335829,339187,342578,346003,349463,352957,356486,360050,363650,367286,370958,374667,378413,382197,386018,389878,393776,397713,401690,405706,409763,413860,417998,422177,426398,430661,434967,439316,443709,448146,452627,457153,461724,466341,471004,475714,480471,485275,490127,495028,499978,504977,510026,515126,520277,525479,530733,536040,541400,546814,552282,557804,563382,569015,574705,580452,586256,592118,598039,604019,610059,616159,622320,6285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};
	scanf("%lld",&x);
	int min=0,med=1880,max=3760;
	while (max-min>1){
		if (x>=y[med])min=med;
		if (x<=y[med])max=med;
		med=(min+max)/2;
	}
	printf("%d",y[min]==x?min:max);
}

Measured memory_bytes: 1784